Great way of putting it, Robert, when you see pics side-by-side like that! :hiclp:
The one with out rounded mouth seems to be prod.number 1404, probably produced only in 1967-68, heights 20, 22,and even 27 cm (?)
The one referred to in this thread is prod.number 1945. Picture found in the reprint of Riihimäen lasi pricelists of the time, but no longer in e.g. 1974 pricelist.Elsewhere it is also stated that these would have been produced in years 1967-73 in heights 22 & 28cm