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Whether you keep it, or sell it, don't reblue it. A BHP with Nazi markings, I believe, has some collector value, reblueing will certainly decrease the value.
Don't get me wrong, I love Glocks but they are a dime a dozen. You can always get one of them. You don't see too many original finish old BHP's with Nazi markings' however. I'd keep the old girl [original] & save for that Glock.