Rollaround

More photos- the marbles are 1-1/8" and 1-1/4". Thank you for any thoughts.

I've tried researching these marbles without success so far. I bought them in the 1990's/2000's era. They are well made with the outer latticino matched with the striped solid core and with aventurine stripes accenting the core. Both have the same signature, looks like an M or maybe Mc ending with a letter that has a tail like g or y. Any thoughts are much appreciated.

Brady Czekanski-Moir Robin Mix