The "Special Order" Atmospheres came in @ 45mm and 50 MM.
I have one of each- neither has any reaction in the clear base glass. The small ones show no such reaction either.
Some of the yellow colors in these reacts as orange.
Check closely for pontils or cutoffs on your two Mojo--they may be contemps--or not.
Old handmades do react like your two do--sometimes. Compare to any "Sulphides that you may have.
Marble--On!!