Omega Speedmaster hour hands.

Donn Chambers

As others have said, the hands are from a MkIi Speedmaster and the dial is a later one. Very likely, your father had it serviced by a local watchmaker in the late 70s and wanted the dial and hands replaced because they were damaged or the lume was not as strong as it had. The watchmaker sourced the parts he could, and used MKIi hands because they fit. It happened a lot back in the day.

Many of the commenters here focus on originality of watches, and really ding ones that have replaced parts. But since this was your father’s watch and he made those changes at some point in the past, I would just keep it as is and wear it. Don’t go down the rabbit hole of trying to make it “original” - it never will be. It’s in good shape for what it is. Have it serviced and enjoy.

Spacefruit

A good looking watch with important family history to explain the current state - probably more valuable to you than if you changed the parts to original, just to please “collectors”

the hands are MkII. The dial is definitely changed, and possibly fishy as others pointed out.

2842xxxx is early, and I would have expected a DO90 bezel, you have a slightly later DN90 in nice condition.

it all fits with the verbal history, and so makes me feel it is an honest watch - one that the history and appearance fit together in a coherent manner, which always makes me feel good.

In that light, the “wrong” parts wouldn’t bother me at all.

(except the crown, I’d change that for the correct one)