Hate to be 'bustin' your bubble" so to speak- but, IMO, as a serious Model 12 man, the Y series Model 12's are to the real Model 12's (the one that WRA killed off in 1963)as are the Jap made Parker reproductions to the real Parkers made in Meriden, CT up until 1934, and the real LC Smiths made in Fulton, NY up to 1945-- All the custom shop Model 12's that were engraved, according to Madis, had the engraver's initals or hallmark on the weapon-- Hard to say where you Y series was 'customized" but my money says NOT at the WRA custom shop-- can we see some photos perhaps- The Y series guns will shoot as well as the pre-1964 guns, and will most likely perform as well for your grandson in years to come as it does for you-- but the collector value will differ from a pre-1964, and IMO again, the pre-WW11 Model 12's (and pre-1920 Model 1912's)were the best ever built, whether field grade or Pigeon, Trap or Tournament--