New vintage piece inbound (168.022)

Syrte

Nice watch, congrats. A 20mm leather strap fits fine on a 19mm lug.
you should never wear a narrower strap in such a case, because the traction of the strap on the spring bar might cause the bar to snap off, and send your watch flying off your wrist. I had ignored that advice in my newbie days, and was glad I was near a couch or something when my watch decided to come off.