Seiko 6306-7001 Scubapro 450

I’ve featured one of these Scubapro 450 branded 6306’s before but that won’t stop me featuring another! These are so scarce (if you discount the thousands of fake dialled 6309’s you see) that it’s always nice to have a look at the genuine article. This one came in for a movement service recently and as you can see it’s in cracking condition.

Seiko 6306-7001 Scubapro 450

The caseback shows it has a production date of October 1978, bang in the middle of the sweet spot for verified Scubapro production.

Seiko 6306-7001 Scubapro 450

With the back removed the 6306 movement is revealed, a 21 jewelled 21,600bph hackable brother to the 6309.

Seiko 6306-7001 Scubapro 450

Once I’d uncased the movement it gave me an opportunity to marvel at how these dials and handsets seem to survive the intervening years with little or no degradation.

Seiko 6306-7001 Scubapro 450

Dig that Kanji day disc 🙂

Seiko 6306-7001 Scubapro 450

The dial side strip under way….

Seiko 6306-7001 Scubapro 450

….and completed.

Seiko 6306-7001 Scubapro 450

I could now turn it over and crack on with the motion work, the autowind mechanism is removed in this shot.

Seiko 6306-7001 Scubapro 450

Power off, balance and pallets out….

Seiko 6306-7001 Scubapro 450

….train bridge off and….

Seiko 6306-7001 Scubapro 450

….it was soon ready for cleaning and inspection.

Seiko 6306-7001 Scubapro 450

Seiko 6306-7001 Scubapro 450

Whilst the movement was cleaning the seals were checked, I found the crown seal was kerknackered. Note the big spline crown, typical of the early 6306’s.

Seiko 6306-7001 Scubapro 450

Once the cleaning was finished inspection showed everything was in great shape, so the rebuild started with the mainspring.

Seiko 6306-7001 Scubapro 450

In this shot the motion work is coming together nicely.

Seiko 6306-7001 Scubapro 450

With the bridge and balance back on the power could be wound on and the movement roughly adjusted and timed.

Seiko 6306-7001 Scubapro 450

I then turned it over and started on the calendar side, here the keyless work is refitted and lubed.

Seiko 6306-7001 Scubapro 450

Almost ready for the dial, just the top cover and day disc to go back on.

Seiko 6306-7001 Scubapro 450

I could then refit the dial and hands. Beautiful.

Seiko 6306-7001 Scubapro 450

Recase the movement and re-assemble the crown with it’s new seal, then it’s ready for….

Seiko 6306-7001 Scubapro 450

….a 6bar pressure test.

Seiko 6306-7001 Scubapro 450

Seiko 6306-7001 Scubapro 450

Needless to say it passed this successfully.

Seiko 6306-7001 Scubapro 450

All too soon it was done, another beautiful example of this seldom seen diver good for a few more years. I have to say that during testing it was super accurate, especially for a 6306/9. After the final adjustment it settled at +2spd measured over four days!

Seiko 6306-7001 Scubapro 450

Seiko 6306-7001 Scubapro 450

Seiko 6306-7001 Scubapro 450

2 comments

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