Quite possibly earlier than 1953. It looks like the release button is in the top. My Pacemaker is from 1953 and the button to open it is on the side. Also, you seem to be missing the optical viewfinder. The leather strap is missing too. The lens serial number will at least date the lens and probably the camera as well if they are both original. CAMEROSITY (1234567890) is the code for the year of the lens serial number. My lens has an RM number making it 1953 vintage. That was confirmed by the original owner who bought the camera and lens new in 1953. I'm only the second owner.
I recently "rediscovered" the joys of my pacemaker. Besides being able to use lens ranging in the 90mm/3 inch through 240mm/10 inch range, I am using some barrel lens with the built in screen shutter. Attached is an example taken with a Danforth 3 inch barrel lens at f64. It is allowing me to use some old petzvals and other shorter barrel lens which won't work on my V8. Enjoy. Jon
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