I can remember filling these milk bottles with milk at Aberlerry farm with my Aunts Kitty and Megan in the 1950's. When the cows where milked on the farm the milk was warm and was cooled then bottled in this bottle and sealed with a cardboard top. Later the bottle top was changed for a different top of aluminum top. The milk was also supplied direct from an urn to a jug if the person so desired in Borth.