Austrian flintlock Pistol for id

[Cerjak]

I found same pistols sold by christies
see below description and pics
A BRACE OF AUSTRIAN 16.9mm FLINTLOCK SERVICE PISTOLS
EACH MARKED '852' FOR 1852
Each with tapering barrel, iron tang, flat bevelled lock with date mark, iron pan and double-headed eagle stamp on the tail, beech full stock, iron trigger-plate, brass mounts including fore-end barrel-band also incorporating the fore-sight and pommel fitted with an iron lanyard-loop, and iron ramrod (iron parts discoloured with some light corrosion marking), numerous inspection marks and Liege proof
9 7/8in. (25.1cm.) barrels (2)