OK, the issue I raised in this thread https://forums.watchuseek.com/f11/opi...ub-487680.html got under my OCD-skin enough to do some research. Here are the results, peer-reviewed paper style. Those of you who want to skip the details can jump to “conclusions” below. I'm interested in your commentary, and I hope the results are useful to somebody. Anyway, I can sleep now, comfortable that the P-Sub I showed is authentic.
Hypothesis: Polerouter Subs with a gap in the word "Genève" constitute a later, but authentic, variant of this watch.
Methods: Internet image search was done on January 2, 2011 using search term "Polerouter Sub" on both Bing and Google. Results were analyzed regarding gap in the word "Genève," case type, movement, bezel font, and caseback markings, both on the inside and outside. Finds were carefully assessed to eliminate duplicate finds (same owner, watch particularities, etc), although duplicates remain a possible source of error.
Results: 22 watches believed to be individual examples were identified. Of these, 19 had a gap in the word "Genève" and 3 did not. Another feature which distinguished these logos were that the points on the trident in "U" were sharper and better defined on the watches that did not have a gap in the word "Geneve."
Of the 19 watches with a gap in the word "Genève," 19 were in straight lug cases with a brushed finish. 19 had a bezel with a relatively thick font. In 13 in which caseback outer markings could be assessed, 9 were plain, three had US Navy markings generally acknowledged to be fake, and one had US Federal Stock markings, also likely fake. In the 8 in which caseback inner markings could be assessed, there were three patterns, reading from top down as follows:
type 1(3 examples) : Acier Inoxydable/SWISS/HF/(Universal logo)
type 2 (4 examples): Brevet 238872/Brev.Dem./(cross)/Acier Inoxydable/(Universal logo)/SWISS
type 3 (1 example): (Universal logo)/SWISS/Acier Inoxydable
In the 11 watches in which movements could be assessed, these were movements were 4 x cal 215, 4 x cal. 215-2, 1xcal. 215-9, 2x cal. 1-69 and 1 x cal 69.
Of the three watches with NO gap in the word "Genève," three were in curved lug cases with a polished finish, and all had a bezel with a relatively thin font. The one caseback pictured had small case numbers at the edge. The one interior caseback pictured corresponded to type 3 above. The single movement pictured was a cal. 215-9. Of note, all three of these watches had dot lume. In other words instead of the entire hour marked being filled with lume, only a small lume dot at its margin had been made.
Conclusion: Internal consistencies in dial and bezel font, lume and case style suggest that there are two variants of the earliest iteration of the Polerouter Sub, one marked by a curved-lug case, dot lume, thin font bezel, and a dial inscription without the gap in the word "Genève," and the other marked by a straight-lug case, full lume, thick font bezel, and a dial inscription WITH gap in the word "Genève." The preponderance of the latter suggests that it is authentic despite the irregularity in the logo. Small sample size of the first variant prevents any conclusions regarding whether one preceded the other, or if they were produced concurrently.
These pictures from Nikolaj (used with his permission) on another forum, which he took in a dealer’s shop, encapsulate the above nicely.