Mint mark looks like that because the pouch that made it had a chip in it (inside bottom curve)...normal for 69 and on all denominations.
Proof coins are struck twice by the die, so you might have a slight
Machine Doubling which also shows at the bottom of the mint mark.
Also not seeing any photos of the motto, but most likely MD...IMO

to CCF good luck on future finds, have fun and keep asking when needed...
