Payen Gearbox Oil Seal X150 (new Payen part number NA049) for Villiers and James gearbox, 4F, 7F, 8E, 12D, 13C, 30C, 3 speed gearbox oil seal.  Unsealed so has quite a bit of surface rust and also the metal ring inside is rusty too. It may clean up, or it may not matter, but I am not sure.

New, old stock

I have no idea if this oil seal is any good.

Sold as seen, no returns.