The Retinette is a lovely cheap but classic metal camera if you don't already know. Mine has a acquired a rattle and an occasional jamming of the winding mechanism as a screw that holds a thing on the top plate has fallen inside. I know full well if I take the thing apart it will never go back together again so, I use it upside down. That works!
See, this is another masterpiece. Not my best masterpiece - but that's coming soon.