vintage blue glass refrigerator water bottle

This item IS NOT marked IN ANY WAY.   Look at other Sparkletts refrigerator water bottles on offer - - - -at the E-Bay site - - - - -compare the photos - -  same glass lid  - - - - - - -same ribbed neck - - - - - -same color - - - - -same function:  re: glass refrigerator water bottle - - - - - - - - this was probably a forerunner of the Sparklettes bottle.   Sparkletts got rid of the sharp edges and went with a rounded shape that fit more easily into the refrigerator.  This is MY idea, There ARE NO EMBOSSED MARKINGS - -  NO NUMBERS - - -NO SYMBOLS - - - -NO WORDS TO GIVE ANY IDEA THAT THIS IS A SPARKLETTS ITEM.  The item has the original glass lid - - - - -unmarked and NOT chipped.  This item has the same aqua-blue color of glass and ribbed collar as the Sparkletts bottle - - - - - -