Eagle Charco 310

Charcoal pencils are similar to graphite pencils. These pencils come in a number of grades. They are often used by artists.

Eagle Crown 862 Copying Pencil

The Eagle Crown copying pencil is a pencil made with high quality. The "Crown" logo and name was originally applied to penholders. One British advertisement from 1881 stated that "Each [Eagle Pencil] Brand denotes a quality of Lead, Cedar, and Finish, "The Crown" being the highest grade that can be produced.

Eagle Ensign 879 Checking Pencil

Pencils that have a blue core on one end and a red core on the other are called “checking pencils”, “correcting pencils”, or “editing pencils” and were originally developed so that editors and proofreaders could make corrections on printed materials before a full-on printing run of newsprint or books. The red end would be used to mark mistakes and to circle or strike errors, while the blue end would be used to make notations, comments, or insertions.

Eagle Turquoise Copying Pencil 4375

The Eagle Turquoise copying pencil was made in 4 grades: soft, medium, hard and extra hard.

Eagle Turquoise Drawing Pencil 375 (early 1940s-1951)

Turquoise drawing pencils came in 17 degrees of hardness, from 6B to 9H. Old advertisements stated that, "Eagle Turquoise is the top choice for artists and draftsmen."  From 1931 to the early 1940s (at least 1941), these pencils would have had the older Eagle logo.

Pre-"electronic" lead Turquoise drawing pencil

The pre-"electronic" lead pencil has a patent date of 1933

The patent referred to on the back of the pencil is Canadian Patent No. 330526 which was issued on 28 Feb. 1933 (US Patent 1892508). The patent describes the "chemi-sealed" treatment of the graphite core which allows it to be securely glued to the wood case. Each major pencil manufacturer had their own proprietary process to do this... woodclinched, leadfast, etc.

Eagle Turquoise Drawing Pencil 375 with Electronic Graphite (1951-1961ish)

These pencils featured "electronic graphite" which the package claims, is "super-refined in Eagle's patented attrition mill" giving "leads of finest texture and amazing point strength." The "electronic" lead was added to the pencil and box design circa 1951 when the patent was granted. I believe patent refers to a change in the graphite formulation which allowed the lead marks to be read by automated readers more easily. 

An Turquoise pencil with "electronic" lead. "Electronic" lead began to be featured in advertisements in the early 1950s.

Eagle Turquoise Drawing Pencil 375 (1961-early 1980s)

Later Turquoise drawing pencils came in a plastic flip case. The pencil design changed and silver end caps were added. The "E Design" logo was registered as a trademark in Canada in 1961.

Berol Turquoise Drawing Pencil 375 (early 1980s-1992)

In the early 1980s, the Turquoise drawing pencil was made using the Berol brand name. At the same time, the color became a lighter shade of turquoise and the silver end cap was shortened but still retained its red stripe.