I saw this on ebay. The knobs look like they came from a ctc4. You can see the outer and inner UHF/fine tune knobs and the outer VHF knob.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160145716959&ssPageName=MERCOSI_VI_ROSI_PR4_PCN_BIX&refitem=330153498213&itemcount=4&refwidgetloc=closed_view_item&refwidgettype=osi_widget