my opinion- this is a genuine handmade glass lamp work bead but that doesn't mean its old- someone has taken a lot of trouble and skill to make this in the style of historic beads -probably from China.
I see this on eBay that's I ask
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F263971180729