National Radio Knobs
 

While cleaning thru the antique electronic mess in my basement today I came
across two National Radio knobs. One is the usual National grey about 5/8 in
diameter and 5/8 in high with a small white spot as a indicator. The other one
is new in package marked HRS-5 "Black knob". Thought I'd check first if
someone can use these before I throw them away. Larry