Stueben signed glass bowl snail or shell 5" MCM lovely

Clear glass bowl incised with "Stueben" on base. Scroll handle resembles a snail or maybe a shell. Thick-walled and heavy at 1 lb. 13 oz. Approximate measurements = 5" diameter bowl section X 3/16" thick bowl wall X 2" tall bowl X 3-5/8" tall to top of handle X 5-3/4" across including handle X 1-1/8" wide handle. Assumed mid-century vintage and made in United States. Very good condition - no chips, no cracks; however, close examination finds some shallow scratches and one place where there is a rub - see pictures.