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.

Eh, i just made it for the sake of it. Would be pretty cool if there was a real purpose for it, though.

The project itself is a pointless sandbox game that can rip the content from select other games you may have installed on your PC.

Yeah, I just assumed it's broken, because it really should be able to do it. The laptop it had once charged fine also complains now.

Funnily enough, my puny phone brick that goes up to 12V1.5A is enough to sustain the battery even while running standalone.

I need this

Didn't pay much attention to it after finding the thinkpad brick. It negotiated 15V3A, but I assume the frame is never going to pull the whole 3A budget.