I have been collecting the Marmit Piggy banks, and one I picked up is missing the bottom stopper. I tried to find a match searching English language, but did not find a good match. I know it's 50mm, so that will help me, but I'm not sure what japanese search terms I should use. Google translate has not really helped. Anyone have a suggestion? Thanks!
Not specific, but might be good to start off with "円谷プロ 貯金箱" aka tsuburuya pro piggy bank EDIT: Including the word "marmit" and linking a google search here: EDIT 2: Sorry I completely misunderstood your question. You can find 50mm piggy bank stoppers by searching "貯金箱 フタ 50mm"