This is in the top five best jars I have found so far. Peltier slags galore! Will update once I open it!

Collection of marbles spanning several decades. Looking for guidance on any items that may be collectible.

What do you think it looks like? Its an interesting one for sure.

Currently visiting Taketomi Island in Okinawa, Japan, and found these two glass marbles in about 15 minutes of beachcombing!
Both were partially buried in little rocky pockets along the shoreline, with just a tiny bit of glass visible. They’re perfectly spherical and look like actual marbles.
I couldn’t find much online about people finding sea marbles on Taketomi, so I thought I’d share!
Anyone know how to tell whether these are old Japanese toy marbles or something else?

Any info would be much appreciated! Just got these from an inherited storage unit and might start collecting now that I have a head start!