Hi Brian. Presumably that's how Cogswell & Harrison got around the Webley patent, by taking up an idea rejected by Webley?! In terms of the barrel being the cocking device and lying flat along the top of the cylinder, anyway.
The Wallace & Grommet appearance of the Certus seems to be to do with having the barrel hinged at the back, but the piston still travelling from front towards the back, same as the eventual adopted Webley pattern. That's my understanding from the patent drawing anyway.
Whereas the abandoned Webley design has the opposite direction of piston travel, with the transfer port running back through the centre of the piston before going up behind the barrel!
Or am I mistaken?
On second thoughts, maybe best not to make the ditched Webley pistol - it doesn't seem very good.![]()