The 1.500 is the finished barrel weight in Kg. Stamp may look like a coma rather than decimal point, because sometimes it is. What looks to you like Ky is actually Kg. It is simply a partial stamping that makes it look that way.
As said previously, model number is quite likely stamped in the wood under the forearm.
Date of MFG will be a Roman numeral stamped on the underside of the barrels near the breech. It does not show in the pics your friend provided, but its there somewhere between where we can see the partial word 'choke' on both barrels and the breech. Too, it could be on the action flat. Please have him take pics of both & post those.
