Need more info on this seikomatic blue yacht

[histoire]

imgur.com/a/BuPIarY

So i bought this one recently, seikomatic blue yacht from 1961 ish with the 603 movement. I came across this post regarding characteristics/quality of vintage seiko movement series which was very informative: wristsushi.proboards.com/thread/20054/62-83-movement-quality-comparison

Now my question is, it's running decently quiet and no funny noises, should i still service it? seller says it's been serviced and they seem like some sort of established buyer/appraisal service in japan. I don't believe there's any funny business regarding frankens/redials based on the vintage catalogues and other samples i've seen online but please do point out if there is.

page.auctions.yahoo.co.jp/jp/auction/v1115735110
Copying the seller name leads me to this website
miyoshido.co.jp/

And follow up, judging by adrian's comments, it seems that relative to newer seiko movements the 603 and the equivalent 395/400 are much more prone to wear. Should I be more careful with this one regarding daily usage/servicing or is it fine?

[HiBeat]

Hi and welcome to our fine forum !   I took the liberty to drop your imgur image into your post so we can all that beautiful Blue Yacht without clicking through.   Hope you don't mind

The watch looks fully legit, all original, and that movement is so clean and shiny it surely has been serviced - well at least dissassembled, cleaned and oiled and reassembled.

As for it being a true daily watch, I guess why not but just lower your expectations and embrace performance of maybe +/- a minute every few days.  That's what embracing a vintage watch means, enjoying it and its spectacular history more so than buying a modern watch.

[histoire]

Thanks a ton, the site was giving me some error about not enough space even though the image was under 1mb.

Yea dubious accuracy just comes with the territory of vintage watches. I switch out and wind my watches every morning so I don't tend to notice big drifts, but ya never know ig.

As a vintage seiko fan it really doesn't help that there's such a vast archive of vintage catalogues to pour through, I can never get enough sometimes.

[twhp101]

Nice to see another Blue Yacht!

I have one with a little more wear than yours, although my caseback is still quite clear. Photos below.

Information is hard to find on these, and as far as I can remember they were only made for maybe two months (March/April) in 1961. Mine is March.

I had mine serviced as it was running when I bought it, but given the age and rarity I wanted to make sure the pivots weren't turning in dried out gunge.

I don't wear mine very much. It's a Sunday Best type watch for me along with my Lord Marvels/Crown Special etc. Everything before around 1965 is generally dressier and I give them an easier life. I'd like to wear them more, and if I had the sort of job where I could wear them then I would, but they'd get destroyed doing what I do!

[nzwatchdoctor]

Beautiful specimens of watches I've never heard of before. 

Re servicing - if they're going well leave them. If they stopping or losing way more than they should then have them overhauled.