It does not appear to be from condensation (see photos).
Vintage Hand Blown Glass Fishing Float 3” Red Buoy With Rope Beach Decoration
Murano Hand Blown Art Glass Sommerso Basket Ruby Red & Clear Handle
VINTAGE Hand Blown Glass BASKET Twisted Handle Yellow Flowers Green & Clear
Deep Pink Hand Blown Glass Candleholder Modern Pair 2
Vintage Hand-Blown Glass Paperweight Orange Clear Controlled Bubble Flower
