[R-390] meter luminescence

[KA9EGW]

Seen plenty of blah brown meters that do nothing but move the pointer, in
'390's and '390A's, in my day.  Never before seen ones where the markings
glow a "Luna Moth green" after exposure to light, like the hands on a Big
Ben clock of some years back.  Were there actually meters that had the
strontium aluminum silicate [I'm guessing at the composition here] rather
than the radium?  73, Brian KA9EGW