Skol appears to be the name of a range of Aseda Glass - as described here (scroll down) as 'Skol - (Small Stones) Series'
https://www.mothersweden.com/bo-borgstrom-vase-overview.htmlhttps://admin.abicart.se/shop/4412/files/About/Bo%20Borgstr%C3%B6m/Skol/Bo%20Borgstr%C3%B6m-%C3%85seda-vase-Model-B5-890.-Height-26-cm.jpgPossibly the design of this series of 'Skol' are items with the base as shown in this link.
Does the base of your vase look like these?
If so, then yours might be a 'Skol' series vase imported by Milnor, designed by Joseph Bourne for Denby and perhaps made at Aseda. Or ASeda might have made these Denby designed pieces which were imported to the States by Milnor but they might NOT be the 'Skol' series. They might just look quite similar to it.
They also might NOT have been made by Aseda - the design might just be very similar to these 'Skol' series pieces which were made by Aseda. i.e. sellers might just be attributing them to Aseda because the design is very similar ... if you see what I mean.
Some written source information would be needed to be sure they were made by Aseda, especially given the Dallas museum info in that American Glass book just says made in Sweden but maker unknown.