ABC Cut Crystal Glass Vase, Hobstar & Pinwheel, Possibly Kelly & Steinman, 10"

The style and quality of this vase are consistent with the craftsmanship associated with Kelly and Steinman.
Kelly & Steinman was a company known for producing high-quality cut glass during the American Brilliant Period (approximately 1876-1917).

Many pieces from this period, including those from Kelly & Steinman, were not marked with a company logo, which can make definitive identification challenging. 
Here are some details about this vase:

Lead Crystal:
The term "crystal" for glass typically indicates the inclusion of lead oxide, which enhances clarity, brilliance, and allows for deep, intricate cuts.

American Brilliant Period (ABP):
This era in American glassmaking is known for its exquisite hand-cut lead crystal pieces, often featuring complex patterns like the hobstar and pinwheel designs seen in the image.

Hobstar and Pinwheel:
These are specific motifs common in ABP cut glass. The hobstar is a multi-pointed star pattern, while the pinwheel is often a less-regarded motif.