Gold-plated Wahl Eversharp pencil. Engine-turned small chevron pattern.
lead 1.1 mm Length 13.5 cm, Thin diameter 6mm
EVERSHARP, the inventor and first successful mass marketer of the mechanical pencil, goes back to 1915. WAHL was the brand name given to some of the finest fountain pens ever made and goes back to 1917. The hyphenated name WAHL-EVERSHARP first appeared on some of the finest “golden era” fountain pens in 1929.
Common Vintage Lead Sizes
The most common sizes of lead for vintage mechanical pencils were 1.1mm and 0.9mm. 1.1mm leads were frequently referred to as "thick" lead and the 0.9mm size was often referred to as "thin" lead. Of course, today, there are much thinner diameter leads made, but we're talking antique pencil leads!
For your reference:
1.1mm = 0.046 inches
0.9mm = 0.036 inches