Shell Ashtray 11½" circa 1957-1976, Earthtones glaze, photos courtesy Thrifted Treasures on eBay

Note: R-1735 and 1735 appear to be the same design and an example marked 1735 is not known. R-1735 is listed in catalogs 1957-1965, and 1735 is listed 1966-1976.

Bottom reads:  ROYAL HAEGER R1735 USA (some text not showing)