This is a Sheaffer Snorkel Sovereign in Sage Green c. 1957-1959. Sage Green was one of the new Snorkel colors introduced in 1957 and pens of this color can have matching color sections, as shown. The Sovereign has an open 14 karat gold nib with platinum mask (similar to earlier Feathertouch nibs), polished stainless steel cap with five engraved or stamped panels, and a gold-filled clip with "SHEAFFER'S" stamped. The cap panels are a set of two straight lines with a dashed and wave or ripple line between. Barrel colors produced were black, burgundy, pastel gray, pastel blue (or aqua), pastel green, buckskin tan, vermilion (a tangerine), and sage green. In 1956, the Snorkel Statesman sold for $12.50 and with a matching pencil, $17.75.