Found this for you - yup it's a mercury 10x16
"That is a very common prop used on many motors from the early 80's thru the 90's. 25hp Bigfoot, 40-70 hp Mercs and Mariners, Force 40,50, and 70hp from the 90'sThe prop diameters vary from about 10.25 thru 11 inches.48-73130 10 pitch48-73132 11 pitch48-73134 12 pitch48-73136 13 pitch48-73138 14 pitch48-73140 15 pitch48-73142 16 pitch48-73144 17 pitch"
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