60s 70s mod smoke brown glass iced tea glasses set, Duz detergent smoky glass

Set of eight 60s or 70s vintage smoky brown glass iced teas, footed glasses about 6 1/4" tall.

We've been told these were a premium given away in boxes of Duz detergent, but we don't know the 'real' name of this pattern or who made it.

All eight glasses are in excellent condition, it's a nice set - carefully collected and never used.