The present watch is distinguished by its very attractive overall condition, most notably the luminous material of the dial which over time has taken an extremely appealing caramel tone. The case is likewise very well preserved.
The watch is from the "Type C" series of the celebrated model, made between 1942 and 1943, serial numbers ranging from 1'010'091 to 1'010'374. Type C watches were initially used by Italian combat swimmers, as of the second half of 1943 also by German combat swimmers trained in Italy. The watches are distinguished by the length of the wire lugs, exceeding those of the other series of reference 3646. The inside case backs feature the signature Rolex S.A. in the centre, below the signature the reference number followed by the seven digit serial number.
For a detailed description of reference 3646 Type C and its characteristics see Vintage Panerai - Watches with History by Ralf Ehlers & Volker Wiegmann, second edition, Vol. 2, pp. 766 - 775.