[Hammarlund] HQ180 with overlay panels for BFO & Vernier tuning knobs

[Tom Streenan]

Hello all,
I picked up a HQ180 (plain) with the factory noise blanker installed but I am wondering  about two small overlay panels that are mounted under the BFO KCS and Vernier Tuning controls.  I took the BFO KCS overlay panel off and the main panel is labeled Slot Depth which is for a hq170.  The rest of the front panel is definitely hq180 because the band select has all of the general coverage frequencies and the radio works as a hq180.  Any ideas on what I have here?
Tom
N7AC