Brian - Congratulations !!!
Yes, it is a 1960, easy to see the slightly more recurved limb tips that point almost straight down, where as the 1959 bow forms left the limb tips pointing just slightly outward. Rosewood Sight Window and Black and White Tip overlays are 1960 characteristics for sure.
The serial number 12P65 is a later 1960 serial number. The serial numbers of the first part of the 60" 1960 Kodiak run started with a "B", as a continuation of the 60" 1959 Kodiak serial numbers.
At 55# and 60", you have one of the most sought after length and weight combination 1960 Kodiaks that was ever produced.
I've used 1960 Kodiaks for years. They are the best in my book, with 1959 Kodiaks being second.
As a retired old fart, and a life long Bear hound, I'm still stuck in that 1959-1960 time warp.
But sure to post some close up photographs of both sides of the riser of your 1960. Some of the Brazilian Rosewood in those 1960 Kodiaks is stunning.