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SBDY093 SRPG19K1 PADI Turtle
15887030

SBDY095 SRPG21K1 PADI Samurai
15887032

Edit: Added global reference numbers and links.
 

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Compass bezel is really niche, and there's no heritage like the Alpinist has. Also, unlike say a 12-hour bezel which you can turn into a 60-minute timing bezel simply by multiplying whatever number X5, the compass bezel can't pull double duty for another use because the markers don't line up at any specific interval. You have to really want the compass bezel.
You can divide by 6 to get minutes, just like you can multiply a 12-hour bezel by 5. Admittedly dividing a larger number by 6 is a harder mental operation than multiplying a smaller number by 5.

EDIT: To clarify, this is on compass bezels that actually have markings for 0 to 360 degrees. On the land tortoise, which just has N E S W and some sub-markings between, it's more work. Each 1/16th mark works out to 3.75 minutes. That's ... admittedly not very useful.
 

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A lumed date window wheel wouldnt be compliant. If you started a dive at 23:50 and then a few minutes later the date changed, there’d be no lumed hour marker where the date window is as it wouldn’t be glowing or visible after the date changes.
Why not? If the entire date wheel is lumed then it should work; there's always going to be a framed lumed rectangle in the 3 o'clock position (which may or may not have a correctly aligned numerical date within it, but that doesn't matter for overall visibility). I think the reason this approach isn't more common is that lume material is expensive, and using ~31X as much as necessary to have a single index isn't appealing from a cost-control perspective. You'd end up using more lume on just the date wheel than on the entire rest of the dial. Although there are fully lumed dials available at reasonable prices (Zelos makes some), so maybe it's still doable.
 

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Why not? If the entire date wheel is lumed then it should work; there's always going to be a framed lumed rectangle in the 3 o'clock position (which may or may not have a correctly aligned numerical date within it, but that doesn't matter for overall visibility). I think the reason this approach isn't more common is that lume material is expensive, and using ~31X as much as necessary to have a single index isn't appealing from a cost-control perspective. You'd end up using more lume on just the date wheel than on the entire rest of the dial. Although there are fully lumed dials available at reasonable prices (Zelos makes some), so maybe it's still doable.
Think the point he is making is that if the next section of the date wheel hasn’t been exposed to any light (as it’s been hidden behind the dial) it won’t glow if it happens hit the date window in the dark. Which to be fair I hadn’t thought of - granted it’s quite a specific circumstance, but could be one reason not to allow it
 

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Think the point he is making is that if the next section of the date wheel hasn’t been exposed to any light (as it’s been hidden behind the dial) it won’t glow if it happens hit the date window in the dark. Which to be fair I hadn’t thought of - granted it’s quite a specific circumstance, but could be one reason not to allow it
It's about as likely to happen as somebody actually using a dive watch for timing during a dive instead of a dive computer. Maybe next time they can add a useful requirement, like the bezel must be partitioned into cooking times for eggs and stuff like that. 🙃
 

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Why not? If the entire date wheel is lumed then it should work; there's always going to be a framed lumed rectangle in the 3 o'clock position (which may or may not have a correctly aligned numerical date within it, but that doesn't matter for overall visibility). I think the reason this approach isn't more common is that lume material is expensive, and using ~31X as much as necessary to have a single index isn't appealing from a cost-control perspective. You'd end up using more lume on just the date wheel than on the entire rest of the dial. Although there are fully lumed dials available at reasonable prices (Zelos makes some), so maybe it's still doable.
You can buy a fully lumed aftermarket date (or day) disc for Seiko movements for about $35. The OEM part costs about $17 retail. So while it would be more expensive to do, it's not a huge difference, especially considering that Seiko could use economies of scale to get their own cost down relative to what a third party supplier would need to charge. You can buy an entire NH35 for a little over $30 for example, and obviously the date disc is not making up half the cost there.

I would guess that the date flipping is probably a genuine problem for compliance. You could go in with a fully charged lumed date at 11:45 PM, (I guess using a UV flashlight or something) and then 15 minutes later, poof, lume is gone because the date rolled over.
 

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Rolex Submariner | Oris | Seiko Prospex Presage | Casio G-Shock
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SBDY093 SRPG19K1 PADI Turtle
View attachment 15887030
SBDY095 SRPG21K1 PADI Samurai
View attachment 15887032
Edit: Added global reference numbers and links.
Simple and good looking. Hope they come here to the USA. But it seems we don't get a lot of the cool models.
 

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You can buy a fully lumed aftermarket date (or day) disc for Seiko movements for about $35. The OEM part costs about $17 retail. So while it would be more expensive to do, it's not a huge difference, especially considering that Seiko could use economies of scale to get their own cost down relative to what a third party supplier would need to charge.
Also, a Seiko-made Lorus field watch with a full Lumibrite dial costs £20-£50, so it's doable. Those things are torches, it's ridiculous.
 

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It's about as likely to happen as somebody actually using a dive watch for timing during a dive instead of a dive computer. Maybe next time they can add a useful requirement, like the bezel must be partitioned into cooking times for eggs and stuff like that. 🙃
Why not just move the date to 4:30?
15888760

Hehehehehe 🤣
 
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