The reference (2390) was not uncommon . . .
By: Dr No : December 18th, 2020-10:11
. . . but the double signature was extremely rare. It was 'Niklaus Bern', a retailer in Bern named Rudolf Niklaus. I'd never heard of Rudolf Niklaus before; he (or they) might even have specialized in Omega given the limited information I've been able to ...