This is a huge, stunning Blenko 366LL crackle glass vase from the early 1960s. The vase came in 3 sizes, with this 12+” vase being the largest, thus the number 366L. The second “L” in the production number refers to the applied leaves, since this shape also was available without them. See Leslie Pina, Popular 50's and 60's Glass, p. 41, for a catalogue page from 1963 showing the different sizes and colors.
Since these were all hand made, there was quite a bit of size variation in the finished products. This one is actually a full 13" tall and 7-3/4" in diameter across the mouth.
Condition: Excellent - no chips, cracks (just lots of crackle), deposits or cloudiness. It is shot through with bubbles.