300.
It is a 70 HP 1975 Evinrude. The 5 indicates the year. I just bought a1975 Evinrude yesterday & looked up the number.
Take the door panel off, you have to loosen the 3-4 large bolts holding the latch, once that is free, you can adjust it. jr
All error coins need to be seen for an accurate assessment. It's best to take it to a coin dealer. Major errors can be worth a significant amount of money.
The 1975 model, 85 hp Johnson outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
In my high school chemistry class, we had an experiment where we mixed zinc with sodium hydroxide, heated the solution, then soaked pennies in it. After a few minutes, the zinc would adhere to the coins, making them silver in color. That said, a 1975 penny is currently worth 2 cents for the copper.