Moncreiff Glass had from the 1920's two distinct buildings in the harbour area - 1/ Shore Works and the Tay Works buildings, so to that extent the YSART GLASS information is out of date. I have no idea what dates they were in use, hopefully at a later date I will go to Perth library to do some research, as they have boxes of Moncrieff Glasswork archives.
This is only circumstantial evidence re A Hendrie, in the Moncrieff Glassworks list employees ledger it shows a A Hendrie starting in 1915.
By 1921 there appears in the ledger a new department named "Hendries Dept " and in the main it seems to be school leavers (14 to 15 years old) who are enrolled into this department.
This would tie in with his position as work overseer.
But the main point is, not where it was displayed (though important) but that it was given to A Hendrie on his retirement from Moncrieff Glassworks, so it begs the question, why would Moncrieff Glass have this ink bottle,on display and given as retirement gift, if it was a Vasart piece.