Once upon a time ....
Any indicator on equipment front panels required an incandescent lamp, sometimes bayonet and sometimes screw thread.
LED??? No such beast in those days
Typically these were used to indicate Power on/off or to back light a scale such as a radio station dial.
Because 6.3V was readily available in this vintage equipment (valve heater supply) these lamps are 6.3V @ around 200mA
TANDY Electronics
2x incandescent lamp pack - new/VERY OLD stock
Part number: 272-1110
GE47
Bayonet style
6.3V (AC or DC unlike LED's these are non-directional)
150mA average current
Testing performed as outlined in the description.
Used item, non returnable