Stub axle identification

Afternoon all. Changing font hub oil seal on my 1965 S2a and noticed the stub axle is marked and has a lot of wear. Now the question is how do i know if its the early (2 piece with seperate land) or later 1 piece stub axle? Although its a 65 S2a its has 6 pot series 3 axles added at one time....not sure on which year.
Thanks.

Silly me, as its got one large and one small bearing must be pre 1980....should of thought of that before

T'is annoying when you forget things you have always known.