Graphic Art - Not an Actual Scanned Image

Obverse Design All lettering is incused. Starting at the top and curving along the edge counterclockwise all the way to the top again are the words "ENGINEERING & CONSTRUCTION DEPARTMENT". In the middle in larger letters are two lines. The first line is "I.C.C.". The second line is "585" (the employee number).
Reverse Design Blank.
Metal Brass Size and Shape Round with a diameter of approximately 46 mm. One small round hole in the top.
Dates Issued Unknown. These may have been id checks locally made and issued before the Diamond shaped Isthmian Canal Commission checks (which were issued starting in August 1905), or they may have been tool checks issued anytime between 1904 and 1914.
Issurer Isthmian Canal Commission, Engineering and Construction Department.
Numbers Issued Pieces include #585.
Rarity Very Rare. Manufacturer Unknown, but perhaps locally made. Source Hamlin's ICC-42, Rulau's CZ C74.
Varieties None known.
Function

These may have been early employee id checks, before the general issuing of metal checks in August, 1905. They may also have been tool checks, or even used to track other equipment. I would appreciate e-mail from anyone who can add anything to the history of these metal checks.

Population Count Known specimens are as follows:
  1. Check #585 - Eugene Hamlin Collection; listed by Rulau.