The bottom ,strange ,seems to have indented pontil(never heard of one) but it is too perfect of a circle if that makes any sense .Maybe just defect in mold ? Thanks
Dang. Looks like a machine made valve mark, but the bottle looks definitely hand blown, with that top, the misaligned mold halves, etc. Maybe it was one of those faint blowpipe pontil marks that they refired, taking away any roughness??? Can you give us a little clearer shot of the base? Wondering if it's a post-bottom mold. Is there a faint amethyst tint to the glass or am I seeing things?