I purchased a topette on etsy recently (see below). The glass seems old and hand-blown, with no seams, and small bubbles within the glass. Also, the individual "dose" bubbles remain a constant volume across the board. The only thing that has me thinking it may not be an absinthe topette is that each dose bubble is only 15ml instead of the standard 30ml.
So, is this the work of cheap cafe owners trying to swindle their customers? Was 15ml an actual dose that we just don't hear about nowadays? Or, did I pick up an antique olive oil decanter? Thanks for any info you might provide folks!