Going from memory only (not a good thing at my age), the Regent was somewhat of an unlicensed copy of the High Standard Sentinel brought in from either Germany by Firearms Internantional.. Pretty sure it was a Hermann Weihrauch “Arminius, Model HW-3. After the closing of FI, I believe that they were brought in by various importers for a number of years.
Those I handled appeared to be solid enough pieces, better than the majority of cheapies, but not heirloom quality. Absolutely could not be dryfired since the firing pin struck the cylinder inflicting damage.
Keep in mind that I could also be wrong.