Please help identify this vintage Omega Seamaster

Hi all, new member here!

Associated images are attached below the text.

My Grandfather recently gave me a vintage Omega Seamaster he was gifted by my Grandma. It was purchased in either 1960 or 1961 in Australia. I was wondering if any of you had an idea as to the reference/catalogue number of the watch? I know this can be identified via opening the case-back, however since I lack the experience I am awaiting the assistance of a professional.

It appears as though the wrist-strap is not original.

The crown may have been replaced or eroded/filed down, as it no longer contains the usual omega crest.

I have seen many similar vintage Seamasters, however I have noticed that many of the hour-markers are slightly different. I’ve searched and found only a couple which have what looks to be the same hour markers as mine; what is the cause for this discrepancy? Have any of you seen an identical version to mine?

if anyone could tell me anything about the watch it would be greatly appreciated. I intend on having it properly serviced/refurbed to get it back up to standard!

Thank you very much and I apologise for my novice questions!

It appears that you have a gold capped 50ies so-called "big seahorse" with a two tone dial that has arrowhead indices. The crown and strap are, as you mention, not original. As you also mention, all the details are on the inside of the caseback. Maybe - and I'm guessing here - it's a cal. 501 or 520 and possibly a ref. 2964, but others are better at getting these things right. Nice watch.

Are theese red dots on dial or crystal?

The red dots are on the crystal. I haven’t cleaned it at all - waiting for the professional!

Thank you for sharing your knowledge! I haven’t seen many arrowhead indices; I’m trying to find a watch online with the exact combo (gold capped, two toned, and arrowhead indices) yet am struggling. I wonder why Omega made these watches in so many different variations? Do you think the arrowhead indices are original?

You’re welcome. Yes, I think they are original. Omega made many different dials for the same case, and that case could be in many different materials. Some variations were then primarily sold in some places etc. That’s also why you won’t always find an exact match online as there are many possible combinations. You can also try to search the Omega Vintage Database. Just google those words and it will come up.

I am also by no means an expert, but Omega did produce a ton of different combinations between dials and cases, which makes a final complete database of all different kinds almost impossible and I also have two pieces which I never found another example of on the web.

It is also the first time I see that kind of dial furniture, but it looks very nice. If I may suggest, a new crystal and/or leather strap of good quality will make the watch appear very dapper. Croco or leather brown straps tend to go well with that tone of gold.

It is a very nice heirloom and gift from your grandfather!

Agree - a new crystal and strap would make all the difference!