Illustrative vintage camera arrangement. It is not an identification chart or a guide to exact model differences.
Describe the camera in front of you
Read markings on the front and bottom. Don't force a jammed film door, and don't open a loaded camera in daylight.
Likely matches
Choose at least one identifying feature to begin.
What to photograph for identification
A straight-on front view; the top plate; any engraved serial or model text; lens name; the film door or back; and a side view showing the folding or finder mechanism. Keep serial numbers private when sharing publicly if you prefer.