Vintage Omega Seamaster date/day dial question

Hi everyone - I am new here. My name is Jack from Taiwan. I am grateful for this website and thanks for taking the time to read my question, I really appreciate if anyone could help me. I've been searching for these two vintage seasmaster models, and noticed there seems to be a difference on the date/day dial on some watches, while other parts are almost identical.

I've attached 4 pictures here showing the difference, you see that on one hand, the split between the date/day on the dial is more of a flat surface stripe, while another is more of a triangular shape with depth. Also, the Swiss Made at the bottom are slightly different and one is close together and the other is farther apart.Which one is genuine? or are they all genuine and the difference is due to the model year? It seems like both models have such difference.

Thank you so much for any help since I am looking to purchase my first Omega vintage.

Start again : " my name is..... I'm from..... I'm very grateful to this forum, that I can ask for a validation of my own research......" Make things polite and easy. Kind regards. Achim

Right away sir! Thanks!

I share your pain I’ve been working through looking at the 70s and 80s TV dials and the level of dial variation is maddening. The photos on the Omega Vintage Database are all very low resolution and incomplete. If other members have a pointer to a trustworthy source of exemplar photos I’d be really grateful.