Original part number 277594, superseded to 204100. Roller bearing surfaces need to be very good. The lower crankshaft bearing surface runs in a plain bearing so it does not need to be as good. The crankshaft has cast in casting number 203711. I think this is a one year only crankshaft. Same crankshaft is in 1956 Evinrude 15 HP.
I am in Maine USA. Tel two oh 7- 3 five three ate won ate ate. Thanks for looking.