What is this cartridge?

Tried to Google but couldn't find any info. Always looking for vintage cartridges to try out.

https://www.ebay.com/itm/264859095223

dhcod09-09-2020 5:28pm

noromance Details Discussions Posts This discussion Message User 10,177 posts 09-09-2020 at 06:57pm Copy Comment URL Report Comment Edit Delete LOL! Beat me to it. I spent too long reading those pages. So basically, it looks to be one of the first MC cartridges.