that appears to be correct - period photos from 'The Pottery Gazette' do show these water sets to include the jug, two glasses and a tray - sets look to have been made in several of Davidsons known patterns. I'd agree, do keep these pieces - they certainly do have some commercial value - if you look periodically on places such as ebay, am sure you will see other items in blue or yellow Pearline, and they should give you some approximate idea as to potential value. You might possibly find another drinking glass to complete your set.