I have a pre-1968 German made Hawes P-25 .25 ACP Semi-Auto Pocket Pistol. The Hawes pistols have very little resale value, mine is in the $100+ range and I paid $60 for it. It is the typical short barrel mouse gun fairly accurate up to 10 yds.
Based on my research on the history of my gun your derringer was most likely imported by Hawes Firearms company based in Van Nuys, CA. until the late 50‘s. Most of the guns were made by J.P. Sauer & Sohn in Eckernforde, Germany.I have seen a several Hawes .22 cal magnum derringers at past auctions and gun shows here in south Florida, they sold in the $100+ range.