MCM Brutalist Studio Nova Frostfire glass mugs by Hoya, 2 pcs, made in Japan

Pair of vintage mid-century Studio Nova Frostfire beer mugs by Hoya, made in Japan. The style is reminiscent of Scandinavian designs of the same era, 1970s, via its bark or ice texture. Excellent condition with no obvious signs of wear. No chips, cracks, cloudiness, etc. Approximate measurements: 4.75" tall by 3" wide, not including handle.