This is the Sentinel, another of the snorkel filling fountain pens from Sheaffer. It was made in the USA around 1955 and is finished in the less common Grey colour with a silvered cap and gold filled trim.
The pen is fitted with a Triumph wrap around nib which writes with a superb Medium Italic line. This is a very rare nib for Sheaffer.
The snorkel filling system was unique to Sheaffer and consisted of a narrow tube that extended out from under the nib. This tube is dipped in the ink bottle and used to draw up the ink into the reservoir. This keeps the nib clean and it was an efficient system that worked very well.
The mechanism on this pen has been fully serviced. The pen is in good condition with minor scratches and wear marks, the plating is in good order.