Your Colt is a Police Positive Special, not a Police Positive, which had a shorter frame and used shorter cartridges. Is this .38 Special? Some were made in .32-20.
It may well be cut-down or else someone added a post-1958 extractor rod. Early Detective Specials had sq. butts, but a short extractor rod.
I urge you to buy some basic gun books, and one of the best to begin with is the late Geoffrey Boothroyd's, The Handgun. It usually won't cost a lot on Amazon, but it's one of the absolute best basic handgun books to about 1970, when it was published. The copious illustrations show many Colt and S&W products through the years.
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