Antique MT Washington Glass Mother Of Pearl Air Trap Quilted Tumbler Yellow

Antique Yellow MT Washington Glass Mother Of Pearl Air Trap Quilted Tumbler 4 Inches Tall. It looks like it has some manufacturing flaws in the bottom. Looks like it's a crack, but nothing is broken on inside or out. It also has flecks of something on the inside and one fleck on bottom, otherwise it's good! - see photos.