Exactly
By: SuitbertW : March 29th, 2013-12:54
Hi, Yes, that's it. You'll find it implemented in many Longines calibers oft that period. As said, trademark is 'ShockResist', don't know which supplirr made it, but will check that. Btw, it's far from beeing primitive, :-) -it's just an early, I'd guess ...