[–] 3 points 3 weeks ago* (last edited 3 weeks ago)

I'm going to guess it's a mod; assembled from aftermarket parts. It kinda looks like it, and the caseback doesn't say seiko. Care to share the listing?

Edit: closest I could find is this:
https://marketplace.watchcharts.com/listing/16851459-seiko-mod-5-sport-1880a-black-automatic-luminous-hands-indexes-men

There's a while community for building modded seikos.

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    I was trying to diagnose how on earth does this thing drain battery even when plugged in. It's in 5V mode, ffs. Temporarily fixed this by using my thinkpad charger, but I guess I need to get new a brick after all.

    If anyone else has charging issues, I used Powersupply and Mission Center in the screenshot.

    [frame] Apparently my 100W brick can't do 15V.