Your gun never had a chamber date. Those recommending a recoil spring check are concerned that the spring was not replaced when switched from .30 to 9mm. This is hardly likely.
I would recommend a local gunsmith do this at this point, unless there is a knowledgeable site member near you who can help. Look up spring/caliber combinations in the search mode here on the site to learn more.
Youtube has several decent videos on field stripping your gun.
I agree with Jerry that your holster is a reproduction.
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