Seiko 6309 Tuna mod

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eawtan
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Joined: 13 Jun 2011 08:43
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Seiko 6309 Tuna mod

Post by eawtan » 24 Oct 2011 21:39

There has been some interest when I posted pics of the mod (6309-7040 dial, 3rd party insert)
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Or 6309-7290 style dial w/ original insert (watch on the left)
Image

Thus I have decided to do a short writeout (I believe CEO also has the same mod).

Inspired by :
http://www.thewatchsite.com/index.php?topic=5469.0" onclick="window.open(this.href);return false;

This mod uses the 6309-7040 (or 7290) movement in a tuna 7549-7010 case.
Why do such a mod? Well, I had a 7549-7010 with a dead movement (probably due to bad coil) and always wanted to have a day-date auto tuna . Personal preferences on the dial, I have kept the 6309 dial to maintain the movement roots, but u can always use back the 7549 dial or the sbbn007 dial .

The 6309 movement is a direct drop in replacement, fits like a glove, but u must use back the 7549-7010 stem as the 6309 stem is too short (7549 case is thicker).
The 7549-7010 has several compatible parts (with the 6309-7040/7290) , which are : bezel insert, caseback, crown (except the stem), gaskets related to the above are also compatible (bezel gasket, crown gasket, caseback gasket). Crystal and crystal gasket are NOT compatible.

Thongsia carries the 7549-7010 gaskets, crystal and shrould screws (all items subject to available stock), but u should provide them with the part number when purchasing.

325W26HB0A HARDEX CRYSTAL
0C3060B0A CASE BACK GASKET
0K0240B0A CROWN & STEM GASKET
EZ3210B04 GLASS GASKET
0C3660B02 ROTATING BEZEL GASKET
81500887 SHROUD SCREW

Pls update here if u plan to do this mod and have questions.

Cheers and good luck ,
I do NOT need another watch , I have enough watches ...
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