Reverse Side is Graphic Art - Not an Actual Scanned Image

Obverse Design Curving along the top is the legend "STEWART - KERBAUGH - SHANLEY CO.". Curving along the bottom is the legend "+ CANAL CONTRACT 12 +". In the center in large size is the employee number ("1858" in the example above).
Reverse Design Blank.
Metal Brass. Size and Shape Round 39 mm in diameter, with a small round hole at the top.
Dates Issued Unknown. The Canal construction was from 1904 through 1914.
Issurer Stewart, Kerbaugh, Shanley Company, who may have been an independent contractor working on the Panama Canal. Stewart may be the James Stewart of CK-72.1.
Numbers Issued Pieces in collector hands include #1858.
Rarity Very Rare. Manufacturer Unknown. Source Nicolas Liakopulos Collection.
Varieties None known.
Function Tentatively attributed as an employee id check for an independent contractor, working on the Panama Canal.
Note This piece is tentatively attributed to Panama Canal work as opposed to some other canal contract.
Population Count Known specimens are as follows:
  1. Check #1858 - Nicolas Liakopulos Collection (pictured above).