Thanks all. I used to be the other way with my other antique hobbies. "Don't touch it, it's mint!" I had a few nice Colts and Smiths sitting in the safe, never being seen. A decade went by, I got older. Older collectors died. None of my guns were really mint, but more like 95%. So I started occasionally taking them to the range, once a year or less, and feeling what they could do. And letting others admire them. It was grand, to punch holes in a target with a 1905 target pistol.
They made hundreds of thousands of Leica Barnack types, unless it's truly mint in box, to me it's ok to use it a little. I just got my first one, a 1946 IIIc, and Youxin just emailed it's ready for it's next adventure! Lube and conservation helps preserve any antique.