Casio HL-4A Portable Calculator, Extra Small Size : Amazon.in: Office Products
File:Vintage Casio Mini Electronic Pocket Calculator, Model CM-605, 6 Digit Bue VFD, Made in Japan, Circa 1974 (11972293654).jpg - Wikimedia Commons
Amazon.com: Calculators Mini Pocket Basic Calculator 8 Digits Display Electronic Calculator Cartoon Candy Color Portable Digital Desktop Calculator for Kids Students School Mix Color : Office Products
MyCalcDB : Calculator Casio pocket-mini aka P-810
Vintage CASIO Pocket-Mini Calculator Electronic P-810 - Tested & Working | eBay
Casio Pocket-Mini P-811 calculator | 102632976 | Computer History Museum