Parabola, That is an interesting lock-up on the barrels of that sidelock (or is it a boxlock, I can't tell!). A sort of spring-loaded blade added to the front lug. Can you enlighten us as to the Patent and the purpose of the blade? Also it appears that someone struck off the original proof marks...I wonder what circumstances gave rise to erasure of the prior proof marks?
Dan, The Perks is a great find, congrats. I am not well versed in Birmingham made sidelocks but the quality looks to be very high. BTW, the auction Perks listed for sale in Scotland was sold...not immediately, but within a month after posting. No idea of the price.
