1977 Merc 850 prop question

[island45]

So I just bought a propeller at a garage sale, its a 13'x19 pitch with the numbers p686-1 and 686265-1 on it, ive been searching the internet but cant find much about it other than it might have come off of a
85hp mercury or force outboard. I have a 1977 mercury 850 and was wondering if anyone knows weather if this would fit my motor or not. thanks!