It finally came in. Tentaku Mechanical Calculator! : r/MechanicalKeyboards
Tentaku Mechanical Calculator Case by RyanGuy | Download free STL model | Printables.com
Ducky Pocket - Have fun wherever you go, the portable mechanical keyboard also as a calculator with PBT Double-shot, R5 profile keycaps, and RGB backlit
DIY Calculator :: Cool Mechanical Calculators
Cute little Tentaku mechanical switch calculator : r/MechanicalKeyboards