For me it is the Roth Steyr Model 1907,it was basically where glock got their striker system from.I think it one of the coolest looking guns ever made.(along with the Luger p08,Frommer Stop and Mauser C96)
Here is some info and pics of it : Modern Firearms - Roth Steyr model 1907 / M.7 self-loading pistol
Here is some info and pics of it : Modern Firearms - Roth Steyr model 1907 / M.7 self-loading pistol