Rocked: You have a S&W K200 British Service Revolver, built between 1940 & 1942 for the British government. The barrel would have been 5 inches long originally and the caliber .38 S&W (The British used a 200 grain bullet in the .38 S&W case as their service round).
Your gun may have been bored out at some point to accommodate .38 Special cartridges. If it has only use standard pressure rounds in the gun as the chamber near the rim will be over sized.
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