Panerai PAM 183 vs PAM 380: Radiomir Black Seal, Manual or Automatic?

Both the PAM183 and PAM380 are manual-wind 45 mm Radiomir Black Seals. If you arrived here looking for the automatic Black Seal, that reference is the PAM388, which uses Panerai’s in-house P.9000 with a 72-hour power reserve. What this guide covers is the subtler but genuinely interesting question: between two discontinued manual-wind siblings that share a case, a calibre family, and a power reserve, which one belongs on your wrist?

What Is the PAM183?

Introduced in 2004, the PAM00183 is the Radiomir Black Seal in its most direct form. Panerai built it around the 45 mm polished 316L steel cushion case that defines the Radiomir family — wider at the waist, narrowing toward the thin wire-style removable lugs, with no crown guard around the righthand winder. The dial uses the sandwich construction that Panerai enthusiasts tend to value most: two layers of metal with luminous material sandwiched between them, visible through apertures in the outer black lacquer layer. The effect under dim light is a warm, sub-surface glow that flat painted dials cannot match. Text-only dial decoration — “RADIOMIR BLACK SEAL” and “PANERAI” — with no graphic brand symbol.

The movement is Panerai’s Calibre OP XI, a hand-wound lever escapement built on the ETA 6497 platform and finished to Panerai’s specification. The 18-jewel calibre beats at 21,600 vph and delivers a 56-hour power reserve. Because the OP XI receives Côtes de Genève striping, blued screws, and a Panerai-signed rotor bridge, the PAM183 earns an exhibition caseback in sapphire crystal — a direct view of the movement when you flip the watch over. For a broader look at this reference family, see our full Panerai Radiomir review.

What Is the PAM380?

The PAM00380 arrived in 2011 under the full name Radiomir Black Seal Logo. The 45 mm cushion case, 26 mm wire lugs, 100 m water resistance, and 56-hour power reserve are unchanged from the PAM183. The two defining departures are on the dial and through the caseback. On the dial: the PAM380 uses a plain painted black surface — no sandwich construction — and adds the Panerai griffin OP symbol below the brand name. This made it the first Radiomir reference to carry the graphic brand identity element on its dial face, a marked departure from decades of text-only Radiomir decoration.

Through the caseback: the movement is Calibre OP II, an earlier and less finished iteration of the same ETA 6497 platform. It runs at 21,600 vph with the same 56-hour power reserve, but without the decorative treatment of the OP XI. As a result, the PAM380 is fitted with a solid caseback engraved with “OFFICINE PANERAI” rather than the sapphire exhibition window of the PAM183. In performance terms both calibres behave identically. The difference is purely visual — and relevant only if you regularly flip your watch over.

Specifications at a Glance

Specification	PAM00183	PAM00380
Full name	Radiomir Black Seal	Radiomir Black Seal Logo
Year introduced	2004	2011
Case diameter	45 mm	45 mm
Case material	Polished 316L steel	Polished 316L steel
Crystal	Sapphire, 1.9 mm	Sapphire, 1.9 mm
Water resistance	100 m (10 ATM)	100 m (10 ATM)
Lug width	26 mm — wire, removable	26 mm — wire, removable
Dial	Black sandwich, no logo symbol	Black painted, griffin OP logo
Movement	Calibre OP XI (ETA 6497 base)	Calibre OP II (ETA 6497 base)
Winding	Manual (hand-wind)	Manual (hand-wind)
Power reserve	56 hours	56 hours
Frequency	21,600 vph (3 Hz)	21,600 vph (3 Hz)
Jewels	18	17
Caseback	Exhibition sapphire	Solid steel
Status	Discontinued	Discontinued

Design, Dial, and Case

Pick either watch up and you are immediately inside Panerai’s language: the polished cushion case catches the light at every angle, the crown clicks with positive resistance, and the wire-style lugs flex subtly to follow the wrist. At 45 mm both watches sit unambiguously large. Neither is for anyone who finds the scale daunting. Case proportions, lug width (26 mm), crystal thickness, and water resistance are identical, so the discussion narrows quickly to the dial.

The sandwich dial on the PAM183 is the detail Panerai collectors discuss most. The outer layer is matte black lacquer; the inner layer holds the luminous compound; and the numerals, indices, and sub-dial ring are apertures that reveal the luminova from below. In daylight the difference from a flat painted dial is subtle — the applied elements have depth rather than sitting on the surface — but in darkness the PAM183 reads markedly better. The PAM380’s painted dial is crisper at a glance, with slightly sharper contrast between the black background and the cream-coloured markers, but it does not achieve the same architectural quality under low light.

The griffin OP logo on the PAM380 divides opinion. Buyers with roots in the brand’s pre-2000 history tend to prefer the unadorned PAM183; those who find the logo-free dial austere often land on the PAM380. The logo is small and sits below the brand text — it reads quietly rather than loudly. But it is present, and on a Radiomir with a heritage of minimal decoration it changes the character of the watch.

Movement: Calibre OP XI vs OP II

Both calibres are rooted in the Unitas/ETA 6497 pocket-watch movement, a large-format lever escapement with a production history stretching back to the mid-20th century. Panerai licenced and progressively refined this platform through the OP designation from the early 2000s, producing variants that ranged from the basic OP I and OP II to the better-finished OP XI. All share the same 37 mm diameter, 21,600 vph beat rate, and 56-hour power reserve.

In practice the two calibres behave identically. Both will drift approximately 10–15 seconds per day in normal service, and both require a full winding each morning to maintain accurate timekeeping. The difference is in the presentation: the OP XI has Côtes de Genève striping, blued screws, and a Panerai-engraved bridge that justifies the PAM183’s exhibition caseback; the OP II is left in base specification, which is why the PAM380 wears a solid caseback rather than a display one.

For context: if you want a manually wound Black Seal with an in-house Panerai movement, that reference does not exist in either watch — the ETA 6497-based OP series was Panerai’s bridge technology before the P.6000 in-house manual movement appeared in more recent references. The PAM372 Radiomir 1940 is the closest current-production manual-wind Radiomir. If you want the Black Seal case with a fully in-house automatic movement, the PAM388 is the answer.

On the Wrist

Both watches wear almost identically. The cushion case distributes weight evenly, the lugs follow the wrist rather than fighting it, and the absence of a crown guard keeps the watch from sitting high. At 45 mm the diameter registers as large on wrists under about 17 cm in circumference, but the 12 mm thickness and the organic case shape make both watches less imposing in wear than the measurement suggests.

The winding ritual is part of the proposition. Both calibres take approximately 40 half-turns at the crown to reach full wind from empty. Wind it every morning at the same point in your routine and either watch becomes effortless to live with. If you prefer to skip the ritual entirely, the Luminor range includes automatic variants in a similar price bracket. For a broader overview of the brand’s current and vintage output, the Panerai brand hub is a useful starting point.

Price and Availability — October 2026

Both references are discontinued and only available pre-owned. The PAM183 carries a modest premium over the PAM380, reflecting the sandwich dial construction, the exhibition caseback, and the slightly more finished movement.

As of October 2026, PAM183 examples in excellent condition are priced at approximately $4,500–$5,000 at established US dealers; box-and-papers sets reach the upper end of that range. The PAM380 trades somewhat lower — well-preserved examples asking $3,900–$4,200, with original documentation pushing toward $4,500. On polished steel condition is everything: heavy or repeated polishing rounds the case lines, removes value, and can be hard to detect at a glance. Inspect the bezel edge and lug junctions carefully when buying either reference.

Which One Should You Buy?

Buy the PAM183 if the sandwich dial matters to you — its layered depth and superior lume performance are real advantages — or if you want to look through the exhibition caseback at the movement. The PAM183 is also the purer historical choice: no graphic logo, no visual noise, just the Radiomir Black Seal as it existed at the start of the model’s run. At $4,500–$5,000 for an excellent-condition example it sits at the sensible floor for a collectible Panerai with genuine provenance.

Buy the PAM380 if you prefer the branded aesthetic, are comfortable spending somewhat less for a near-identical wrist experience, or want a more recently produced example that is easier to find with intact documentation. The painted dial is not a compromise in daylight; the solid caseback is irrelevant to most daily wearers. The PAM380 also benefits from a shorter production history to the pre-owned pool, meaning pristine examples are still reasonably common. Explore the full range of Panerai options in our Panerai Luminor buying guide if you are still weighing the Luminor against the Radiomir.

Buy neither if you want an automatic movement. Both PAM183 and PAM380 require daily hand-winding, no exceptions. The PAM388 Radiomir Black Seal 3 Days Automatic is the direct successor in spirit: same 45 mm cushion case, Panerai’s in-house P.9000 calibre, a 72-hour power reserve, and a date window at 3 o’clock. It trades at a higher price point but brings a level of movement independence — and movement quality — that the ETA-based references cannot match.