Thanks for the reply, no number under the nut and washer like my 25 johnson. I did try a puller with chains with no luck, started to bend blades. I may need to cut it off. Been treating it with PF for a few weeks.That's a Mercury lower unit.
The prop, if it's still OEM should have a part # under the nut and washer.
DM 21824 propeller , that # shows it's probably an aftermarket, maybe a Michigan prop, maybe a Solas??
Somewhere between a 10p-14p
I use a puller with 3 chains adapted to the head. It needs a BIG hose clamp to keep it tight or the chains slip off.