For your consideration, here is a Vintage Texas Instruments Slimline Business Analyst II Calculator, serial no. 2035164 ATA5079, with instruction manual and cover.  It comes with the battery and has been tested some.  I did not try all of the functions.  The calculator has little wear on it.  Most of the wear is on the cover.  The instruction manual has 59 pages. Item pictured is the actual item up for sale and comes from a non-smoking household.  (168.63s-.11hc)