An example of our classification work: The reference 3646 is divided into seven production groups (Type A – Type G), of which the different caseback markings and numbers (inside) are just one of the most important indicators.

The illustration shows the following caseback versions:
Ref. 3646 / Type A Oyster Watch Co (large)
Ref. 3646 / Type B Oyster Watch Co (small)
Ref. 3646 / Type C Brevetee Rolex S.A.

You can read and see more about the different versions of Ref. 3646 watches in our 2nd book ““The References” 1930’s-1940’s.

A very interesting 3646 / Type C watch will be auctioned soon at Auktionen Dr. H. Crott (LOT 379). It’s matching in all details with our database, where it is listed since august 2009. In this condition, such Panerai watches are quite rare to find in these days. It comes even with an original leather strap, which is absolutely hard to find, as most of the original straps were cut off after long time of use, because the lugs on 3646 watches are welded to the case (which caused the straps to be sewn onto the lugs / not interchangeable like on Ref. 615X watches ).

Our database entry (click above) shows the following detials: Inner caseback signed 1010288. Rolex Cal. 618 / Type 1 movement. Dial signed “Radiomir Panerai” with redish aged numbers and markers. Steel hands. Onion shaped “Brevet+” crown.

We hope it will find a good new home!