If it doesn't have a model number on the frame under the crane (the part the cylinder swings out on), it was made before 1957. This appears to be a Terrier. After model numbers started being used in 1956, it became the Model 32. As indicated on the barrel, it is chambered for the 38 Smith & Wesson cartridge NOT 38 Special/38 Smith & Wesson Special/38 S&W Special. Basically, it is a frame that was originally designed to be a six shot 32, which has been manufactured as a 5 shot 38. It does have some collector value and appears to be in good condition. 38 S&W ammunition is available but if you ask for it in a store, make sure they understand you want 38 S&W not 38 Special. This cartridge was also called the 38 Colt New Police but no ammo with those makings has been manufactured for quite a while. I’m sure others will be able to give a closer estimate of the year of manufacture from the serial number and other features. It is a neat little gun from a bygone era.