Belated Welcome to the forum........ Grips during that period can have the last 2 numbers of the serial number or the E/655 stamp or sometimes both.
Make sure all numbers are matching. Check for any signs of refinishing. The condition of the bore should more or less be in the same general condition as the gun. A gun with a really nice outside should have a good bore. A nasty barrel would not be expected.........
Good luck.....
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dave
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