23rd Field (SP) Regt. never used M7’s. They started their training with Sextons while still in Canada, having received their first Sextons in April 1943.
While Field Regiments with towed guns used Tac signs with “AA” “AB” etc; SP Regiments often used “A1” A2” …”B1” “B2” etc. So you will have to find pictures of 23rd Fd guns to see how they were marked.
Ram OP’s were replaced by Sherman OP’s as the war progressed. Below is a photo of a Sherman OP belonging to 15th Fd Regt at wars end.
