Maker: Sheaffer. You may be looking for a different model of Admiral, depending on vintage; there is the Balance, the Touchdown, or the Snorkel version to consider. This page refers to the Triumph era version.
The Admiral was one of the more protean pens in Sheaffer’s roster during the 1940s. When the name reappeared after the war, the Admiral II appeared as a non-white dot version of the Triumph-pointed line. In 1947, with a dropping of the Roman numeral, the Admiral returned to an open point whose general description is not very far from the previous Balance model. This later form of the pen differs from the Craftsman physically in the point, which is a number 5; that generally means it is platinum-masked and imprinted with the “Feathertouch” logo, but this is not uniformly so.
Production Run: c.1945 – 1950 (this pattern remained in place through the first couple of years of Touchdown pens, until the Thin Models appeared).
Cost When New: $5.00 (for modern value, try this calculator).
Size: 12.8 cm long capped, 15.1 cm posted, 11.2 cm uncapped.
Point: 14k gold, usually with platinum mask (usually).
Body: Celluloid until 1947, then Forticel
Filler: Vacuum, capacity approx. 1.2 ml or lever, capacity approx. 0.9 ml. Only lever available after 1948.
If you are relying on the preceding information to win a bet or impress a teacher, you should read the site’s scholarly caveat. Remember, this is the internet, and it’s full of bad information.