Ashtray 7" circa 1970-1977, Sunburst glaze, photos courtesy gwescat on eBay

Note: 2028 and 2028-X appear to be the same design and an example marked 2028-X is not known. 2028 is listed in catalogs 1970-1977, and 2028-X is listed 1973-1974.

Bottom reads:  HAEGER © U.S.A. 2028