How about some photos? They would help immensely. Sounds like you have a H&R Defender which the British purchased during WWII when they were desperate for arms. The caliber is .38 S&W, (not .38 S&W Special), and the guns aren't especially rare. Without a picture it's practically impossible to see the context in which "92" is used, but, if it's a metric caliber designation (which the Brits did not used in WWII), it's most likely "9.2."
Again: Pictures, please.