These were made by Don Wentzell from an original mould and were made in 4 colors & low numbers:(26) cornflower blue,(22) amber,( 26) cobalt blue, and (26) purple blackglass. This one is purple blackglass and weakly base embossed on skirt edge with the ARMSTRONG DP1 and MADE IN USA embossing. These are extremely difficult to locate and acquire the entire set of 4.The mould that ~appears~ to have been used I can very weakly read what looks like 68 : for a 1970 mold. Has a tiny white pinhead sized stone in the very corner of the LWG lip that caused a tiny NGM blemish. Displays mint. $160 shipped USA. Package will weigh over 4 US pounds so I will assist with shipping outside USA. NOW $138 shipped USA. Package will weigh over 4 US pounds so I will assist with shipping outside USA.