The model 37 indicates an "air weight" aluminum frame. It is the aluminum frame version of the model 36. Generally the model 37 is not plus P rated unless so marked on the barrel.
A model 637 is the stainless/aluminum version of the air weight and is plus P rated.
Cartridge
50-250 USD
MOdel 10 or 12
Smith&Wesson model 14
A K frame revolver
50-400
Yes
100-300 USD
100-400 USD
10-300 usd
50-300 usd
CTG stands for Cartridge