yamaha 30 g/box identification

[havencottage]

hi i have a 1986 yamaha 30hp, manual tiller, which seems to have been fitted with another g/box sometime in its life.
does anyone know what other outboards this could be off as i need to replace the prop, which yamaha obviously cant help with as it is unlike any yamaha modek.
it is a NOT a through exhust type as all yamaha 30s seem to be.

[boats.net]

Have no idea, don't remember seeing a 30hp model without thru hub exhaust gearcase.

[bumperfood]

are you able to post a picture--worth a thousand words