It looks it has the short cylinder of the 25-3 vintage vs the longer 44 mag length cylinder of 25-5 vintage. That means a 25-5 barrel would not work with that cylinder as the barrel shank would be to short unless enough was taken off shoulder to allow 4 more turns of barrel in frame and then you would need to shorten the ejector rod way up.

So, it is either a miss marked 25-3 or a 25-2 modified using parts from a 25-3

Might be pictures though. How much room between frame and cylinder

25-5 type


25-3 type