Jeffreys bought from the Trade too rather than make actual guns. I have an old G & S Holloway catalogue in front of me and they were makers to the gun trade. The model No. 3900 is identical to yours in every respect but for the engraving on the lock plates but that feature may have been for special order anyway copying that popular by Holland & Holland for that period. I can photo copy the page and post it on to you if it is of interest. No date on the catalogue but would think early 1900's. Lagopus…..