Uncommon Yellow MFC Slag & 3 AKRO Corkscrews w/ Fluorescent Qualities

Condition: Mint
Grade: 9.7
Size:  11/16″ +/-

Set of 4 great marbles my 10 yr old grandson asked me to sell for him- so cute! 3 are Corkscrews with fluorescent qualities (uranium glass, yellow & blue cork turns Orange & Blue, and the yellow cork in translucent base glass has a fluorescent orange tracer around the outer edge of the spiraling corkscrew) and 1 very uncommon YELLOW MFC SLAG with the “9” and opposing Cut Line. All are Mint.