Pretty sure that is the right attribution, not been able to find this exact shape in a book though. A very lucky find in a charity shop with six of each size. If I am right they date to the mid 1920s but no idea how to distinguish production between Venini and Cappellin if unsigned.
Very finely blown in a pale straw yellow with opaque white trails on each rim, depending on thickness and angle they can appear blue. Heights are 10.5 and 6.25cm.
In the following ebay listing there is what looks like a small vase in the same colour combination as these glasses, the vase might be shape 1758 CV or 5250 MVM (page 111 Vittorio Zecchin, Transparent Glass for Cappellin and Venini), like many of the designs it would have been made in a variety of sizes and variations:
https://www.ebay.co.uk/itm/186205113417John