These vintage LEDs are new old stock, made in the USSR, part number AL102BM.
They measure 5mm diameter with a 4mm diameter lens. They have a metal case with clear dome lens and light up a dim red.
Get a piece of LED history, once these are gone, they're gone!
- Minimum luminous intensity Iv: 0.2 mcd at 10mA
- Vf maximum: 2.8V
- Reverse voltage maximum: 2.0V
- Forward current maximum: 20mA
- Wavelength: 690 to 710nm
- Operating temperature: -60 to +70°C
Note: many of these have bent pins. This is normal and how they were generally supplied.