I have recently gone a bit overboard and purchased several of these pale Topaz water bottles. (Some would argue that the overboard thing is not so recent!) I guess the color intriques me. It shows none of the orange amber color in the thicker parts of the glass as is typical of Blenko’s Topaz. Below is a photo of the unusual base color of this water bottle.
Blog Update October 3, 2013: A curious collector got me to check and I found that this water bottle has the raised ridge on the bottom. We believe that the raised ridge mold was retired in the mid to late 80’s so this is probably Wheat. I have changed the title listing from Topaz to Wheat.