Unearth a fascinating piece of potential history with this vintage jail key, marked "VIAT MULE STEEL CO SAN ANTONIO TEXA" and "CARL J. AGERBECK, CSI." Research suggests Carl J. Agerbeck was a member of the Construction Specifications Institute (CSI), an organization involved in setting standards for the construction industry. Could this key be linked to Agerbeck's work in the design or construction of correctional facilities in or around San Antonio? While the exact connection remains a compelling mystery, this key offers a tangible link to the past, possibly bridging the worlds of construction and the history of incarceration in Texas. A unique find for collectors of historical artifacts and those intrigued by untold stories.