cagney,
The quality of the engraving is right up there with Pairpoint. By the weight of the glass, and the resonance ring when tapped, I believe it to be indicative of leaded glass. The rough pontil was fire polished, or heat treated, to soften the edges. You are also correct in saying that the high domed foot would not cause a problem if the pontil was left in the rough, i.e, scratching furniture, nicking fingers, or being seen.
Nazz