What year Mariner is this?

[sutor623]

Anyone know what year Mariner this is? I have it posted on the Yamaha area too because it seems to be a Yamaha motor. From what I can find, the 8hp Mariner/Yamaha was produced from 1974-1987. I can not find any badging on it though.......





Here's what was stamped in the cowling.

 

[sutor623]

How many different models of the 8HP 2 stroke did Yamaha make?