A side-by-side view onto two Ref. 6152/1 Vintage Panerai watches. While both watches with the legendary crown protecting device using a “Luminor Panerai” dial, their movements are different: The left Ref. 6152/1 is powered with an Angelus Cal. 240 SF (8 days) movement (15 Rubis and Incabloc shock protection, signed “JUIN .61″) and the right Ref. 6152/1 is powered with a Rolex Cal. 618 / Type 4 (17 Rubis and Incabloc shock protection) movement.

Noteable is also, that the opened casebacks are different too: on the caseback of the watch with Angelus movement, the Rolex stamp has been milled off, while the watch with Rolex movement is bearing the typical 6152/1 stamp in the middle of its inner caseback.

Small – but interesting – differences can be found in the Rolex Cal. 618 / Type 2 movements used in vintage Ref. 6152 Panerai watches: the bridges received different engravings, being technically the same (15 Rubis, no incabloc shock protection). Note the different position of ROLEX and 15 RUBIS!

For a better understanding, the differences are colored:
Rolex Cal. 618 / Type 2 = pink
Rolex Cal. 618 / Type 2 mod. = yellow.

Such differences in engraving the bridges are similar to the Rolex Cal. 618 / Type 1 and Type 1 mod. movements, which were used in Ref. 3646 Panerai watches. We have published these differences in our 2nd book “Vintage Panerai – The References”, in the chronological classification (page 12-29), and also illustrated in chapter I.VII (page 149).

Referring to our earlier posting about the different Rolex movements in vintage Panerai watches, the characteristic features of the Type 2 movement (used in Ref. 6152 watches) are:

15 Rubis, no Incabloc shock protection
(balance cock engraved with a “plus-minus scale”)
16 Lines, power reserve approx. 36 hours.
18.000 half-oscillations per hour.

As just recently another rare Ref. 6152 watch surfaced, we know that there exist different engravings on the bridges. In the graphic here you can see the first discovered version with “ROLEX” and “15 RUBIS” engraved on the center bridge (see chapter II, page 180 in our book “Vintage Panerai – The References”). The other today known engraving version is shown here (Beside the differences in the engravings, the characteristic features of both movements are the same).

You can read and see more about the different versions of Rolex Cal. 618 movements in Panerai watches in our 2nd book “Vintage Panerai – The References”.

Nice detail view of a Rolex Cal. 618 / Type 4 movement, working accurate in a 6152/1 “Luminor Panerai” watch.

The characteristic features of the Type 4 movement are:
17 Rubis, Incabloc shock protection
(balance cock engraved with a “plus-minus scale”)
16 Lines, power reserve approx. 36 hours.
18.000 half-oscillations per hour.

You can read and see more about the different versions of Rolex Cal. 618 movements in Panerai watches in our 2nd book “Vintage Panerai – The References”.

Used in the minority of Ref. 6152/1 watches, the Rolex Cal. 618 / Type 3 movement comes with 15 jewels and the Incabloc shock protection. It was another development to improve the quality of the movements, after earlier Ref. 6152 watches held 15 jewel movements without the Incabloc feature. The escapement bridge is similar like on Rolex Cal. 618 / Type 2 movements, typical for movements powered with 15 jewels.

Compared to the Rolex Cal. 618 / Type 4 movement, which is used in most of the 6152/1 watches, the engravings on the movement bridges show clear differences. The “ROLEX” and “FAB. SUISSE” engravings changed their positions. The “SWISS MADE” engraving and the engravings of the jewels used (“15 RUBIS” on Type 3 / “17 RUBIS” on Type 4) changed positions as well.

You can read and see more about the different versions of Rolex Cal. 618 movements in Panerai watches in our 2nd book “Vintage Panerai – The References”.

Used in Ref. 3646 watches from Type A to Type G, the Rolex Cal. 618 movement comes without Incabloc shock protection. Typical for the non-incabloc version is the serif font for the letters A-R (French) and F-S (English) engraved on the regulation device (later versions show “+/-” symbols – see also Type 4).

The central bridge shows the “ROLEX 17 RUBIS” engraving on the left side. This engraving is used only in Ref. 3646 watches from Type A to Type D, as the Ref. 3646 watches from Type E to Type G bear “17 RUBIS FAB. SUISSE”.

You can read and see more about the different versions of Rolex Cal. 618 movements in Panerai watches in our 2nd book “Vintage Panerai – The References”.

Interesting detail of the Rolex Cal. 618 / Type 4 and Type 3 movements: the small Cortebert symbol, engraved on the movement base under the balance cock. Both types of Rolex movements were used in Ref. 6152/1 watches (Type 3 = 15 Rubis version, Type 4 = 17 Rubis version).

The illustration left shows a Rolex Cal. 618 / Type 4 where the position of the “Cort” engraving can be found.

You can read and see more about the different versions of Rolex Cal. 618 movements in Panerai watches in our 2nd book “Vintage Panerai – The References”.

Movement view of two Ref. 6152/1 watches: Rolex Cal. 618 / Type 4 movement (17 Rubis and Incabloc shock protection) and the Angelus Cal. 240 SF (15 Rubis and Incabloc shock protection, signed “JUIN .61”) on the right.

Both watches have the legendary crown protecting device. The device of the watch with Rolex movement (124806) is signed “BREV. ITAL” and “9”, while the watch with Angelus movement (124784) is signed only with “3”.

Interesting to see, that the watch with Rolex movement has different hands (double pencil shape) compared to the watch with Angelus movement, which usually comes with single pencil shaped hands. Note also, that the size of the “Luminor Panerai” is different (smaller on dials with Angelus movement).

You can read and see more about the watch 124784 in our 2nd book “Vintage Panerai – The References”, chapter VI.III (page 312-329).

Movement view of two vintage Panerai watches: Rolex inside…! 
The differences in decoration and engraving of the bridges are clearly visible on Rolex Cal. 618 Type 1 and Type 4 movements.

During our research work we created for a better understanding a subdivision of 4 movement types, which is an important feature of our database of today’s existing vintage Panerai watches. Basically they are all Cal. 618, but they show differences in many details.

Beside the engravings and different decoration, the main identifying features are:
Type 1 = 17 Rubis, no Incabloc (used in Ref. 3646 Type A – G and in Ref. 6154)
Type 2 = 15 Rubis, no Incabloc (used in Ref. 6152)
Type 3 = 15 Rubis, Incabloc shock protection (used in Ref. 6152/1)
Type 4 = 17 Rubis, Incabloc shock protection (used in Ref. 6152/1)

Left watch: Ref. 3646 / Type D
Rolex Calibre 618 Cortebert Type 1.
16 Lines, power reserve approx. 36 hours, 18.000 half-oscillations per hour.
17 Rubis, no Incabloc.

Right watch: Ref. 6152/1
Rolex Calibre 618 Cortebert Type 4.
16 Lines, power reserve approx. 36 hours, 18.000 half-oscillations per hour.
17 Rubis, Incabloc shock protection.

You can read and see more about the different versions of Rolex Cal. 618 movements in Panerai watches in our 2nd book “Vintage Panerai – The References”.