Seiko 7A38 - by the numbers

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Forum Home > Bend it, Mend it - Mods & Wreckers > My new modded Franken Seiko 7A38

miromustang
Member
Posts: 22

This is my latest result of modding my seiko 7A38-7190. Original had damaged case, no bracelet and water damaged dial. I acquired new dial, dial ring and new hands. I have sand blasted the case and new bracelet. I am very pleased with the result. :) 



January 14, 2014 at 7:49 AM Flag Quote & Reply

miromustang
Member
Posts: 22

If somebody has a dark day/date wheel that would like to sell please contact me via PM

January 14, 2014 at 8:04 AM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

Very nice indeed !  I presume the dial / hands and minute ring donor was a 7A38-704B (or very badly faded 7A38-704A/C) ? :|

January 14, 2014 at 8:45 AM Flag Quote & Reply

miromustang
Member
Posts: 22

It probably was from the 7A38-704B. I got the dial and hand set alone, and they are in mint condition. Now I only need dial matching day and date wheels. ;)


January 14, 2014 at 9:07 AM Flag Quote & Reply

Sir Alan
Member
Posts: 457

Very nice - I really like the dial and hands on the 704x.


Do you think there are any more of these available from where you got them?



January 14, 2014 at 9:52 AM Flag Quote & Reply

miromustang
Member
Posts: 22

This was the only one among others that had all matching parts

January 14, 2014 at 10:45 AM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

I have managed to get hold of NOS 7A38 black day and date wheels in the past (from Seiko Australia). They still show the Black English / German day wheel p/n 0470695 in stock, but the date ring, p/n 0801594 is now shown as obsolete and no longer available.

Probably your best bet is to look out for a cheap 7A38 donor with black day / date wheels - like a stainless 7A38-7270 for example.

If you really wanted matching day / date wheels, I'm a bit surprised you fitted the dial and hands to this movement, rather than waiting. You now potentially run the the risk of damaging the hands, by pulling and re-fitting them another time - somewhat unnecessarily. :/


I must say though, that 7A38-7190 / 7A38-704B is an interesting Franken combination. Not one I'd personally considered myself - and rather a fortunate choice of components. I presume you have the 7A38-704B minute ring sandwiched between the 7A38-7190 bezel and case, exactly where the original Tachymeter ring would have sat. Don't know if you were aware, but in a 7A38-704x (which has no separate bezel), the minute ring fits from underneath, along with the dial / movement assembly. I tried it myself this afternoon and a 7A38-704x minute ring fits perfectly inside a 7A38-7190 bezel - they're almost exactly the same diameter. Lucky fit, perhaps. ;)


January 14, 2014 at 11:30 AM Flag Quote & Reply

miromustang
Member
Posts: 22

I had to see how it looks all assembled. I am not afraid of damaging the hands because I have proper tools to do the job and hands are just gently hand pressed on shafts. About dial and dial ring I guess I was lucky. The guy who sold them to me had three different dials and only this one was complete. I also got the ring that is a part of 704b assembly but now I don't need it because of a different case layout as you mentioned :)

January 14, 2014 at 2:14 PM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

I actually hadn't mentioned that additional ring - but I presume you mean the thin metal spacer ring used in the 7A38-704A/B/C. ;)

January 14, 2014 at 2:24 PM Flag Quote & Reply

miromustang
Member
Posts: 22

Yes the spacer. It probably holds minute ring in center of the case?

January 14, 2014 at 2:35 PM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

I can't remember, off the top of my head, but I think it sits underneath the crystal gasket, and as you say effectively limits the upward movement of the minute ring. I accidentally ordered one a couple of years ago. The description on Seiko's database was a bit vague.

Seiko Oceania still show both parts in stock:

84304723 DIAL RING (UPPER) = The metal spacer ring

84311485 DIAL RING (LOWER) = The plastic minute ring

In fact, what I was supplied with (besides the spacer ring p/n 84304723) was a 7A38-704A/C minute ring. I wrote about in this thread:

http://www.seiko7a38.com/apps/forums/topics/show/7635490-over-priced-incorrectly-identified-seiko-spares-caveat-emptor


January 14, 2014 at 2:54 PM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

I had to see how it looks all assembled.


By the way, I take it from the above - and looking at your photo again, that you might not have a new crystal fitted yet ? 

Rather than a boring flat 31.0mm Ø x 1.5mm flat mineral glass, you might want to consider something very slightly domed. ;)

January 14, 2014 at 3:15 PM Flag Quote & Reply

miromustang
Member
Posts: 22

You're right. I will get a new crystal. I haven't looked for it yet. Do you have any recommendations where to get it and which one?

January 14, 2014 at 6:12 PM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

You know after I'd written that, I wasn't sure whether there was a crystal fitted to the watch in your photo, or not. :roll:

The 7A38-7190 uses a clear nylon crystal gasket (not black nylon like the 7A38-7270 / -7290, etc) - so I'll blame it on my eyesight. :P

I was thinking a domed crystal might work better with the dial, because the 7A38-704x's have a domed (flat bottom) crystal, which gives a slight magnifying effect. Might be worth trying a Cousins p/n DF150CMH310. :/


January 14, 2014 at 7:03 PM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 12380

In something of a belated postscript to this thread, Miroslav listed his bead-blasted modded 7A38-7190 on eBay yesterday evening - some 5½ years after he built it and documented it in this thread. :)


http://www.ebay.co.uk/itm/183865401284


I'll write it up in full in the Heads Up on another 7A38 Franken thread presently, simply because it'll make for an interesting comparison. ;)


June 30, 2019 at 2:57 AM Flag Quote & Reply

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