Need help with year

[phelps 1]

The model # is 50deto. 6h5 L. I also need to know what size pitch the factory prop is

 

[99yam40]

I cannot help with year, hope someone else will be able to help on that, but motors do not come from factory with a prop.
the dealer that sells the motor installs the proper prop for the boat it is mounted on.

and some times it is wrong for that application or load and has to be replaced to meet the owners needs