Thanks for showing the extra photos. As the base is smooth polished, it does not really help with the period because that can apply to any time.
Had there been a pontil scar, often the form of this can be good indicator of when the weight was made. I have found that when a PY weight has a pattern set in clear glass, rather than a coloured ground, then if the pontil scar would show through, the base would be ground and polished. But there are examples where this has not been done so, as with many of the clues, it's not foolproof.
Anyway, the purple tint to the glass does strongly suggest a 1930s date.