This is one of the uncommon REX variants that just missed being pontiled. The base has some wear that obscures actually knowing for sure. It's certainly right on the cusp. It has an applied double collar top.

Embossed: W. M. REX / 525 GREEN ST.

Height: 7 3/8" 
Color: cobalt blue

Condition: structurally perfect with no chips, dings, cracks or bruise. This is a tumble cleaned bottle that is pretty clean from stain but that retains overall scale type wear and some swirl etch. It's a tough bottle to find without any damage and this is a decent example although far from perfect.

Reference Number:  GW317