Omega Seamaster Cal. 1030 - Original Dial and Correct Config

Hello everyone!

I'm considering purchasing this vintage Omega Seamaster for my personal collection and would really appreciate your opinions before making a decision.

The watch is advertised as having a manual-winding caliber 1030, priced at approximately BRL 3,870 (around USD 730).

According to the seller, everything is original, the dial has never been refinished, and the movement has been serviced.

Unfortunately, I don't have the case reference yet, as the seller would need to open the caseback to check it.

My main concerns are the dial's originality and the overall consistency of the watch.

Since the caliber 1030 dates from the 1970s, while the case and dial appear somewhat reminiscent of earlier Seamasters, I'm wondering whether this combination is historically correct.

I'd particularly appreciate your thoughts on:

1. Does the dial look original, or are there any signs of a redial?
2. Do the movement, dial, hands, crown, and case appear to be a correct combination?
3. Is the plain caseback with the "WATERPROOF" engraving consistent with this type of Seamaster?

I understand that the case reference would help with identification, but I'd appreciate any observations based on the available photos.

I'm mainly looking for a genuine, historically correct Omega to wear and enjoy, rather than as an investment. I don't mind natural aging, but I'd like to avoid a refinished dial or mismatched components.

Thank you very much for your time and expertise!

Quick update: The seller has provided a photo of the inside caseback, and the reference is clearly 135.070.

From what I've found, this reference is normally associated with the no-date caliber 601, while this watch has a date window and caliber 1030.

Would this suggest a mismatched caseback or a watch assembled from different Omega parts?

I'd really appreciate your thoughts. Thank you!