Crack it open. Bets on it being a screwgear?

Anyway, you will have better luck with a motor who isn't geared. For ex., https://www.amazon.com/Speed-Permanent-Magnet-Generator-3000RPM/dp/B0768DVMYN/ref=sr_1_2?dchild=1&keywords=12+dc+motor&qid=1610674425&sr=8-2