Mid-century vintage advertising pocket scale/rule for engineers/machinists

Old 1940s or 1950s vintage industrial advertising pocket scale for engineers, machinists etc.. Vintage geek chic. This scale is made of stainless steel and advertises "All Brake & Drive Unit Service, Inc. - 5551 Ogden Ave, Cicero 50, Illinois - Clutches - Breaks, Foreign & Domestic for Automotive, Industrial & Earth Moving Equipment". It measures 6" long and is calibrated in 1/16ths and 1/32nds . It is in very nice condition.