Indicator lamps from a deckel FP2 - the incandescent is
a 24 volt, one watt miniature bayonette.  The LED type
is a direct drop-in replacement by Dialight, model no.
585-5525 which is rated 30 mA at 28 volts.  Uses about the
same power as the incandescent but much brighter.

Cost from Newark Electronics is twenty bucks however.

From Jim Rozen