You may have one there--the bottom left is a MK imho, the bottom right looks crappy enough to be a Master Glass cat
Please do not take off and run with the "Potato Chips" mention. Like @wvrons says, one mention of a name on the interweb and a name takes off.
Master Glass cateyes are some of the worst ever made by anyone in the entire world--I like an underdog but none of them deserve a name or any notoriety.
They are collected by me because they are the worst--but I like them just the same--kindof like a beat up "german handmade"--they all deserve a place.
Marble--On!!