Maker: Diamond Medal.
The Diplomat was the high end of the Diamond Medal line, available in a full-size clipped version and a shorter ring-top. The dates given for the production run below are somewhat speculative; I\’ve seen pre-Parker Diamond Metal pens with a tapered cap in the same mode as Sheaffer\’s Balance line, and I make an assumption that the flat-top will be an earlier form.
Production Run: c. 1925 – c.1930
Cost When New: $3.98 (for modern value, try this calculator).
Size: 11.5 cm long capped, 14.4 cm posted, 10.0 cm uncapped.
Point: 14k gold.
Filler: Lever, capacity approx. 0.9 ml
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.