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Bohn Omnitrex SR1 desktop calculator with classic green vacuum fluorescent display. Model: Bohn Omnitrex SR1. Back label: Bohn Rex-Rotary, Model Bohn Omnitrex SR1, 7.5 volts DC, Power 1.5 VA, Serial No. 3711391-1.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.