FrogNog, the mark you described is 2 capital Rs joined together, one facing right and one left: it is the mark of Revue Thommen the Swiss manufacturer of the movement. The MSR stands for Manufactures Suisse Reunies, an association of Swiss watch makers. I’m assuming that the K1S is the caliber, or type, of movement. I think you’re correct about it being from the ‘70s, or even mid to late ‘60s. One interesting fact about Vulcain watches is that Presidents Truman, Eisenhower, Nixon, and Johnson all wore one. As far as quality or prestige goes, Vulcain/Revue watches are about mid-way between, let’s say, Timex and Patek Phillipe . As for its “value”, I wouldn’t want to hazard a guess: there are so many variable to consider. The number of jewels in it and the fact that it’s a “skeleton” model are both good points. You MIGHT get more details from
[email protected] Grovana owns Vulcain/Revue. If I get anything else, I’ll post it.