Obverse Design Three lines of legend go across the check: "MFLS LOCKS", "155" and "TOOL CHECK" where "MFLS LOCKS" is in medium size letters, "155" is in large numbers and "TOOL CHECK" is in small letters. Reverse Design Blank. Metal Brass. Size and Shape Round, about 26mm (1 inch) across, with a round hole top center. Dates Issued Unknown. Issurer Miraflores Locks. Numbers Issued Pieces in collector hands include #155 and #188. Rarity Very Rare. Manufacturer Unknown. Source Sales on eBay. Varieties Two similar tool checks exist. One says "MFLS LOCKS" and the other "MELS LOCKS" (note the second letter changes from "F" to "E". The "MFLS" variety has "MFLS LOCKS" in medium-size letters and the "MELS" variety has "MELS LOCKS" in smaller letters. Function Tool checks were used to control access to tools. The worker would turn in the tool check in exchange for a tool. If the tool was not returned, management would know which employee had checked it out based on the number. I would appreciate from anyone who can add anything to the history of this piece. Population Count Two specimens are known to me as follows: Check #155 - Sold on ebay on July 15, 2004 for $9.00 with free shipping. Check #188 - Sold on ebay on June 16, 2006 for $12.50 plus $2.50 shipping. Note: the same number may be issued more than once.