Thanks for your help everyone. I don’t mind it being unique so may just take it as is and keep an eye out for a dial. It was cheapish so I’m not too fussed.
I’m in Australia and wouldn’t be confident fitting it myself but it’ll likely need a service and the guy I take them to would do it for me during that process.
Edit: seller's photos below.
With that case back and those hands, your watch should look like this.
With that case back and non SpeedTimer dial (different hands), your watch should look like this
If you're in Australia, without a doubt look up forum member VTA a leading authority on vintage Seikos and their repairs. Not only will he service your watch, but can help to source a dial. Definitely contact him.
What do you think about this 6139-6002 from july '75? It has no crown, but I think it has the stem. It's on auction now with not many bets.
The photo of the back is too blured so thee numbers are not visible.
Some will call this an "Aussie Pogue," a 6139-6002 made for Australia, New Zealand, Hong Kong markets I believe. It's delineated by that color chapter ring with a gold dial. Whether or not this particular one is genuine to that watch; I don't know. I know there has been debate about the "Aussie Pogue." I don't know if it's been settled and what the consensus is. I'd be curious to know if it has the Roman numeral day wheel since I've been led to believe it was use for that market. The "Aussie Pogues" I have seen labeled as such came with that style bracelet.
Of course this is all an opinion based on what I've accumulated and am not an expert.
The dial, hands, chapter ring, and bracelet look genuine and in nice shape under the scratched glass. The bezel insert is a little beat up. Can't see the sides of the case to tell if it's been polished.
I know about the Aussies, I think there are consensus on its originality.
Yes this is a bit scratched, but I think it is in quite good condition for its age. I'm attaching a photo of one side, it looks scratched too. Is the crown easily available? and the stem in case it's needed?