22 Aug 2012, 00:43
Actually, it's not...look closely...your "upside-down" 5 is really a 9. Stamping depth and clarity varies a bit among these early P2s. In any event, I'm glad to see the part arrived safely and is correct for your watch. I've developed a pretty good technique for repairing the bowtie battery connector; you might want to post a pic of that, too. You wouldn't believe the methods I've seen used to do this simple repair...I think the one that used model airplane cement takes the prize! The 3115 P3 that did this same solid-gold/stainless steel mix is, IMHO, one of the rarest Pulsar models made, if we're to judge by relative frequency of appearance; in ten years on eBay, I've seen eight P1s, one 3115, three 2975s.
I've usually seen the early-type battery connectors on the module referred to as "fan-blade" or "pinwheel". They are spot-welded to metal contacts and can (and do) break off if too severely flexed.
I have four 2975s now; it appears they were done in two limited, rather closely-spaced runs (my serials are 11262, 11461, and 11621, and one other at 10856). I doubt they made nearly a thousand of these...4-5 hundred seems more likely, given the number known in collections, and their infrequent appearance at auction. The 3115 is even a tougher case...mine is 266535...I'm betting any other will be close...although, I seem to remember seeing a 2975 with a 3115 caseback some time back, with a serial number in the 13xxxx range (should have saved the pic), so there may have been at least two short runs of 3115s as well.
On the metal-allergy suggestion; I'm not buying it...gold is infinitely more corrosion-resistant than even the best stainless, and while nobody is allergic to gold (people who claim to be are actually reacting to the copper that is typically in any jewellry alloy), a LOT of people are acutely sensitive to nickel, a universal component of stainless steel alloys.
The stainless backs were most likely a simple means of telling the 2975s from the 2980s, which had solid-gold bracelets, instead of goldfilled (the 2980 also had a SG caseback ring, but that could be far more easily overlooked than the back itself).
Bearing in mind that the serial numbers on the P2s started at 10001, it is clear that these are all very early P2s, indeed (and, of course, mixed in here are the Hamilton-marked casebacks, too, but that is another story!).