Graphic Art - Not an Actual Scanned Image

Obverse Design Lettering incused. Top line "PANAMA" Second line in a larger font "4159" (employee number). Last line curving along the bottom edge "CONSTRUCTION CO.".
Reverse Design Blank.
Metal Probably Brass Size and Shape Round, but diameter unknown. Possibly 39 mm. Oval hole or slot at the top.
Dates Issued Unknown. The Canal construction was from 1904 through 1914.
Issurer Hamlin states that this series was believed to have been used by the R.W. HEBARD Construction Company, who apparently was an independent contractor working on the Panama Canal.
Numbers Issued Pieces known to be in collector hands include only #4159.
Rarity Very Rare. Manufacturer Unknown. Source Hamlin's MISC-10, Asociación Numismático's ID-19.
Varieties None known.
Function Tentatively attributed as an employee id check of the R.W. HEBARD Construction Company, an independent contractor working on the Panama Canal.
Population Count Known specimens are as follows:
  1. Check #4159 - Eugene Hamlin Collection (simulated above).