This calculator is so old that they were still experimenting with how the digits should be displayed.. And yes, that is actually how the zero looks. : r/interestingasfuck
VFD Display for the TI83+ Calculator : 12 Steps (with Pictures) - Instructables
Remember When Everyone Was Using Solar Energy?
Canon Canola L 100 A - VINTAGE DESKTOP CALCULATOR - vfd display [0402201295] - $35.00 : Suburban Relics, good relics cheap
TI-45: Rejuvenation of a faded VFD-Display - Printable Version
Vintage SIGMA TRS 6212 PD Desktop Printing VFD Calculator Made In Japan
File:Vintage Bohn Omnitrex Electronic Pocket Calculator, Made In Taiwan, VFD, Circa 1973 (15992278795).jpg - Wikimedia Commons