Retro modern amber glass stacking ashtray set of 3

Spectacular hand-made retro mod stacking ashtray set from Viking Art Glass.  Read more about Viking Art Glass.   Shown in the Viking 1970 catalag as part no. 6822 (large), 6821 (medium) and 6720 (small).  The large measures 7½" long, 6½" wide, and 2½" tall. Medium is 5" long, 4½" wide, and 2.25" tall. Small is 3½" long, 3" wide, and 1½" tall.  Together they weigh 4 lbs. Beautiful, thick golden amber glass changes intensity with the thickness of the glass. Looks like rich honey. Hand-made in 1970s USA, by Viking Art Glass, West Virginia.  Rare to find as a complete stacking set.  Useful as catch-all bowls, candleholders and incense burners too.  High quality glass. No damage.