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SARCO is a gun parts supplier that usually has a vast array of exploded diagrams that will show you how to break down a particular weapon.
25-160
what age serial # 917400
400
50-500 USD
Find a gunsmith and ask for help
Best to let a gunsmith show you how.
You specifically have the Iver Johnson TP-25 pistol. These were produced on US-made frames from the Iver Johnson location in Jacksonville, AR with internal parts produced by Erma-Werke in Germany. Your gun was produced in the late 1980's.
Best left to a gunsmith if you don't have a manaual
You should ask a gunsmith for help.
25 ACP, German made, 50-150 USD
Impossible to answer without a detailed description of all markings and condition