Omega Genève MD 111.0108 authentic?

It is gold-filled (at least not gold), looks like 1972. 111.0108 is the reference.

here is someone selling a similar one (with a little bit of a worn crown: https://www.ebay.com/itm/388538709732).

Case on this one seems reasonable, though the lug at 11 oclock looks a little bent to me, or at least poorly polished on the inside. The dial doesn't have the 'pop' that the one on ebay has though, so perhaps a bit dingy?

Movement picture isn't very good/detailed, but it at least looks reasonable and has everything. The few things I CAN see out of it shows that it probably needs a service (there are some hairs 😀 ).

Quite correct, Omega Case Metal Code "MD" indicates "Plated 20M yellow, steel back".