Recently i found some of these rare 5 digit 7-segment modules from the 70s.
Once found in calculators and watches these tiny GaAsP LED modules amaze with their tiny, crisp, deep red segments with a whole digit not even 3mm tall.
I have created a simple breadboard friendly interface board featuring current limiting resistors and 2 shift registers (one for anodes and one for cathodes) for simple interfacing with modern microcontrollers.
Design files are found on the hackaday.io project page.
5082-74xx modules on a breadboard 
Bottom side 
Top side