From consulting with Enicar collectors, this is the issue just after the Expedition, taking full advantage of the Sherpas exotic name. When I get it to my watchmaker, I will have pix of inside case back. But from my reading, there was just a small window from end of Expedition(May)to registering the Sherpas name(November) to issuing this watch. And Turtle lugs were correct for 1956. So, my guess on date is late 1956. Will post more when I can. The 1957 models started to have Sherpa on the dial. This is an advert in 1957 with Sherpas still the name Dibs, duly noted
Sometimes I think I've got the hairiest wrist posting on this forum. I think I've even got @Darlinboy beat... Imperial Venus 170 on a early 1960's expansion bracelet. Taking the missus out to dinner.
Just brought this one home from the swiss GTG in Lausanne yesterday! Thanks @Lonestar for the smooth transaction!