The present watch is from the "Type C" series, which was produced from 1942 to 1943 only. These watches were numbered by Rolex from between 1'010'091 to 1'010'374. "Type C" 3646 features a wider length of the lugs. The inner case back is engraved with the signature Rolex S.A. followed by the reference number and case number.
Reference 3646 "Type C" can be found with two different types of dials. The first generation of aluminium "Sandwich" dial and the second with a rivet dial. The aluminium "sandwich" dials were made of anodized aluminium, signed "RADIOMIR PANERAI" and was first introduced in 1941 or 1942 to replace the plastic rivet dial, a commercial failure in terms of durability and functionality.
The present reference is also distinguished by the unusual dark amber colouration of the luminious, this rare feature is cased by the different composition of the Radiomir luminous paint used in the first series of the dial. This phenomena is explained in Panerai - Una Storia Italiana by Luciano Capullo & Loris Pasetto as, "The colour of the markers in the dial plate sandwich dials varies from ochre or dark yellow to dark amber. It is likely that these differences arose from the varying zinc sulphide and radium bromide combinations in the Radiomir as the right balance of the two was only established after the delivery"
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