Day date part # - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old Yesterday, 09:49 PM   #1 (permalink)
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Default Day date part #

Anybody got a list of the part numbers for 7S/4R day date discs? Specifically looking for the black day for divers (day at 3, stem at 4)
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Old Yesterday, 10:00 PM   #2 (permalink)
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Originally Posted by Acidstain View Post
Anybody got a list of the part numbers for 7S/4R day date discs? Specifically looking for the black day for divers (day at 3, stem at 4)
Funny you should ask ... I just saw an eBay listing for these:

https://www.ebay.com/itm/Seiko-Day-D...1/163439485034

I guess you might be able to figure out the part numbers by holding up a mirror to the seller’s pictures ;-)

Here’s something you could explain to me, though ... are the wheels different for different stem positions, or is it just the location of the window that matters? I’ve wrestled with this on 2824’s, but don’t know much about 7S/4R stuff.
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Old Yesterday, 10:06 PM   #3 (permalink)
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Quote:
Originally Posted by Acidstain View Post
Anybody got a list of the part numbers for 7S/4R day date discs? Specifically looking for the black day for divers (day at 3, stem at 4)
Funny you should ask ... I just saw an eBay listing for these:

https://www.ebay.com/itm/Seiko-Day-D...1/163439485034

I guess you might be able to figure out the part numbers by holding up a mirror to the seller’s pictures 😉

Here’s something you could explain to me, though ... are the wheels different for different stem positions, or is it just the location of the window that matters? I’ve wrestled with this on 2824’s, but don’t know much about 7S/4R stuff.
This is tricky to answer. Typically a stem3 date3 disc will not work for A:stem3 date4 and B:stem4 date3, the numbers will not be dead center of the date hole. But there are some exceptions. Sometimes watch designers just “cheat” where they position the date window (or the stem/crown) at “around” 4 Oclock by shifting the date cutout 1-2mm up or down. Same with the crown position.


To add: most branded watches do use the dedicated date 4 disc (or date 3 stem 4). I only see the “cheats” on the cheapest of watches.

Last edited by Acidstain; Yesterday at 10:22 PM.
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Old Yesterday, 11:04 PM   #4 (permalink)
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Black disc with white lettering (red for Sunday)
3 oclock date window
4 oclock stem location


Seiko Part Number 0878207




You might remember I did this for my SRPC49 to give it the total black-out.
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Old Today, 01:53 AM   #5 (permalink)
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Thank you. Wonder why the ebay seller had 0160299 as part number.

I'll be using a black day, and white date disc. I saw some mods on WUS that had that combo. Looks nice. At a quick glance the white date kinda acts like the missing 3 o clock marker, making them look more even/symmetrical.




edit: just looked it up 0160299 is a discontinued part. probably the older part # from first gen 7s26

Last edited by Acidstain; Today at 01:57 AM.
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Old Today, 09:27 AM   #6 (permalink)
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Just to complete things, the part number of the white day wheel for the 4 o'clock crown position is 0160 287.

Last edited by Marine; Today at 10:59 AM.
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Old Today, 01:43 PM   #7 (permalink)
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I did the white date, black day on my Monster with an NE15 movement. The black day came from the 4R36 that was in it and the white date was on the NE15 already. I was lazy and didn't want to swap the date disk. Plus, I wanted it a little different.



If the stem is at 3:00 or 3:45, the date disk will line up. That's why Seiko shifted it from true 4:00 position. One less part to make or keep in stock. My Sharkeys have the stem at true 4:00. Not sure how they pull that off.
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Old Today, 02:26 PM   #8 (permalink)
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Originally Posted by bk_lake View Post
My Sharkeys have the stem at true 4:00. Not sure how they pull that off.

Have another look at your Sharkey, all the Sharkey 6105 homages ive seen on the interweb appear to have the crown just after the 4.
Ive never looked at one in the flesh though.
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