Need help/advice in researching an old two-band Tower Enfield P-53 made by Barnett in London. Located on lock behind hammer is a picture of a "crown", with the word 'TOWER' directly underneath the "crown". In front of hammer is the word 'BARNETT', and the word 'LONDON' in directly below 'BARNETT'. The only other visable marking (while gun is assembled) are two stamps/marks located opposite side of percussion cap. One is theletter 'P' with a small crown on top of 'P', and the other is the letter 'V', with a small crown on top. Both of these are markings are horizontal. After disassembling gun I found inside lock plate the letter '8' and the word 'BARNETT'. On barrel belown percussion cap is .50 5 (with the second 5 being smaller than the 5 in .50). Belown this are the numbers 25 25 (I've attempted to space all numbers as they appear. A few inches away numbers towards end of barrel is 'BARNETT WP'. Only other marking I found is on top of the brass trigger guard, and it is 'WP' and the number '2' directly below 'WP' (this can only be seen when trigger guard is removed. There are no visable marking on brass butt plate. Appreciate ANY HELP!