Welcome! This appears to be a factory model 19, but in all your photos the factory stampings have been removed and redone. As seen in photo 3, "15231 US" is not a true model 19 SN (it would have had a K and several numbers, then later three letters and four numbers). "If" the 6" barrel is original to the gun it should have been model stamped and had the SN where the numbers near the extractor rod appear in photo 4, but this appears to have been ground off and restamped as well. The stocks are factory as well, but the upper left panel has been altered.

In the USA this gun would be illegal to own with an altered or removed serial number; the laws of your country may be different. Sorry to be the bearer of bad news.

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Alan
SWCA LM 2023, SWHF 220