Can you double check the serial number? The OP line picked up from the Army Special, which picked up from the New Army & Navy model. The OP was made 1927-1969, but was not made in .38 S&W (.38 Colt New Police) after WWII. The serial number range 1927-1946 would be 513xxx to around 700xxx.
In any case, some good pictures will be needed to provide any realistic valuation. I will note that those "between wars" Colts are nice guns, but plentiful, and rarely bring over $250-300 unless in exceptional condition.
Jim
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