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Heuer Carrera caliber 12 panda (1970s) Calibre Heuer 12

scratches and abrasion on chronograph plate

it's as if the case wasn't made for the movement - when I put the case back on, I get the same marks on the new chronograph bridges that I had on the old ones

putting in a 1.0mm O-ring as a case back gasket will keep the case back off the movement