Model D8T - Sheaffer Balance Oversize Ebonized Pearl Lever Fill (Visulated) - Made in USA.
Black radite cap and barrel highlighted with inlaid abalone flakes, with gold plated trim, fitted with a 14K solid gold Sheaffer number 8 Lifetime nib with platinum overlay. The cap as a 1/8" band and a flat ball radius style clip with white dot, the barrel incorporates the lever filling system with a visulated gripping section.
 
The Dates and Sizes shown below are an approximate guide.
Circa - 1936-1938
Length of Pen Capped - 5.59" (142.1mm)
Nib Point to end of Barrel 4.78"(121.5mm)
Length of cap 2.64" (67.3mm)
Diameter of Cap 0.59"(15mm)