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April 1969 6139-6000 Speedtimer...

https://i.postimg.cc/QdddJY4B/Picture1.jpg

April 1987 6309-7290

https://i.postimg.cc/JhxjNmw7/IMG-2820.jpg

April 1968 Seiko 6159-7000 with countdown bezel...

https://i.postimg.cc/rsD94jJV/6159-7000-842271-1.jpg

I like the 6306-7001, I always think the 6306 is a 'better' 6309.
I prefer a leather strap - more comfortable than the OEM rubber strap.

November 1978 6306-7001..... with the lovely creamy...

A couple of PROOF dial 6138-0010 UFO's, both are from May 1970
One JDM (Japan Domestic Market) Speedtimer
And a RoW (Rest of World)

https://i.postimg.cc/rs1Np0Hs/P1240774.jpg
...

Daini Seikosha 62mas

https://i.postimg.cc/59BnWHt4/62mas-Daini-05062020.jpg

Brown Bullhead… one of my favourites!

https://i.postimg.cc/vBhGP1K8/IMG-0740.jpg

1971 6139-6002

https://i.postimg.cc/Qxh4dH3Q/Picture1.jpg

At any time there are usually several of these 'Sunrise' on eBay... and they are all fakes.
Here's a genuine Sunrise...

https://i.postimg.cc/dtFNzRCQ/IMG-2902.jpg

6105-8000

https://i.postimg.cc/Vvq5VyN8/6105-8000-921126-1.jpg

A rarely seen 6139-6000 Silver 'Proof'

https://i.postimg.cc/25yW8ZQD/IMG-2751.jpg

April 1969 6139-6000 Speedtimer....

https://i.postimg.cc/QdddJY4B/Picture1.jpg

Seiko ANA (All Nippon Airlines).

https://i.postimg.cc/tRFfZ5xq/ANA1.jpg

https://i.postimg.cc/PfmwgLBV/ANA3.jpg

https://i.postimg.cc/Dfqxxw5n/ANA5.jpg

1972 Seiko 6138-8010 grail with original bracelet....

https://i.postimg.cc/cLHDwVHC/IMG-2322.jpg

Seiko ANA (All Nippon Airlines) ... available on board only.

https://i.postimg.cc/tRFfZ5xq/ANA1.jpg

Previous pic is a rare Daini produced 62mas made in very small numbers in 1967.
Note the beige colour lume of the Daini version.

Below is the more plentiful Suwa produced 62mas, also produced in...

April 1968 Seiko 6159-7000

https://i.postimg.cc/rsD94jJV/6159-7000-842271-1.jpg

1978 6306-7001 Scubapro 450

https://i.postimg.cc/KcBtMNpm/IMG-0559.jpg

1967 Seiko Daini 62mas...

https://i.postimg.cc/59BnWHt4/62mas-Daini-05062020.jpg

Most of them are fakes..you are right to be cautious, this one looks good though!
I’ve got two of these over the years, and researched them thoroughly.
Like everything else, knowledge through...

One of the less common 7548-700C.....

https://i.postimg.cc/13JB0Vyw/7548-700-C-4-D9417-1.jpg

1969 6139-6000 Speedtimer...

https://i.postimg.cc/QdddJY4B/Picture1.jpg

I like the non GS Spring Drive watches.... here's my SNR015 GMT:

https://i.postimg.cc/MKWxWYGP/Picture1.jpg

Today I've gone for a 6306-7001. I always think of these as a slightly better 6309.
Duncan has serviced this one and it seems to run about +2 seconds a day!

I absolutely love the creamy patina of...

1978 Brown Bullhead... one of my favourite Seikos.

https://i.postimg.cc/j5tsQ6Zk/IMG-0741.jpg