I can't help much, but I haven't seen one like it 'yet' attributed to Riihimaki.
I have one, sort of similar but the bulbous part on yours is too high and too fat. The top on mine flares out: it sort of looks like a 'yard of ale' with a clear base (does that make any sense at all?
) I don't have a photo on my computer, or I would post it.
Max is the one with the knowledge......................I believe.