I find the Charlton value of $85 is a bit low for a two digit radar from 1954. I usually see these going for 100 or more in Unc.
Yours is a very nice number in that it repeats every 2 digits, which probably makes it the most desirable type of 2-digit radar.
Also, alot of radar collectors don't care so much about grade and the 25% quoted in the catalogue is too harsh.
Your note is worth at least $50, and on a best offer basis you'd possibly find someone willing to pay as much as $75-$90.