I think I have it narrowed down to the KM 1177, as it weighs 12g - putting it somewhere between 1954 and 1963. Gorgeous coin in hand. My guess is SH1339 (1960), let me know how I've done guessing. Thanks for the help:
If it was one of the better dates, I’d probably hold on to it. As it stands it’s only a $9 coin in 63 according to Krause...so in the auction it goes.