My 1971 Burroughs C3155 calculator. It was made before they decided on how digital number displays should look. That zero at the end is not a mistake.. That's actually how it's supposed
File:Vintage Unisonic Electronic Pocket Calculator, Model 890C, VFD (Vacuum Fluorescent) Display, Sealed Battery Pack, Made In Japan, Circa 1975 (16390017822).jpg - Wikimedia Commons
Vintage APF Mark 25/Memory Electronic Pocket Calculator, VFD, Made In Japan, Circa 1975 | Pocket calculators, Calculator, Vintage
File:Vintage Qualitron Electronic Pocket Calculator, Model 2446R, aka Slide Rule, VFD, Sealed Battery, Made In Taiwan (14176731331).jpg - Wikimedia Commons
CALCULATOR CASIO FX-31 TESTED BLUE VFD DISPLAY SCIENTIFIC W/ ORIGINAL AC ADAPTER | eBay