Type the number off the movement. This tells you which reference sheet covers it — identification, technical bulletin, or both — before you pay anybody anything.
Nine sheets of American Watchmakers Institute microfiche — bought, and arriving in October. Identification sheets run to 1655. Technical bulletins run to 4315. Anything above that comes out of the GF 620 factory catalogues instead.
SECTION I — MOVEMENT & PARTS IDENTIFICATION
SECTION II — TECHNICAL BULLETINS
SECTION III — SUPPLEMENTAL
Knowing the sheet exists tells you the answer is findable. It doesn't tell you whether the movement in your watch is the one the case was built for, whether the dial has been refinished, or whether the crown and hands are later service parts. That's what the written report is for — six photos, the weight, a day's patience, every line cited to the volume it came from.
Not sure of the number? The calibre is stamped on the movement itself, usually under the balance. Photograph it and send it over — I'll read it for you.
GET IT IDENTIFIED — $75Nothing to pay until I confirm it's answerable