Browning HP 9mm pistol manufactured by John Inglis in Canada during 1944-1945.
This is a special model made for Demonstration Purpose (DP) in a separate serial range complete with an original shoulder stock.

Note Chinese characters on the slide. Only the earliest pistols were marked in this manner. The Inglis HiPower was originally manufactured for the Chinese in WWII, but quickly adopted by the Canadian government

Note unusual DP serial number.