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Is a very complicated to take off the back case in the futurematic..I've always been a bit hesitant with mine
I figured it'd be Wadsworth,
Not really? the back comes off with the movement attached. I pulled the clamp off that is in the little indent (though I don't think it provides attachment to the case, I think that is friction fit only), which revealed plenty of room to fit a screwdriver and was able to pry it out.
Not just Wadsworth. Keystone and Lapwell (L with circle) also made gold-filled and 14K gold cases for the Futurematic. Keystone made some of the steel cases, although many were made in Switzerland also.
I'm not familiar with the makers of the E501 and E502 Swiss made cases.
gatorcpa
I guess lecoultre also did some casing in the USA?