1967-1969 is rife full of back door mint shenanigans, the double struck 1967 50c and dollars and 1969 1c and 10c are well known.
This one, plucked from a mint bag, was likely not. A lovely example, and in a grade usually reserved for normal business strikes.
https://www.PCGS.com/cert/37951197 I actually thought they were a bit tough on this one, aside from the usual weak strike from 1c being struck on nickel 10c, this one looks like a MS-66 in hand.