The HST-3000 is currently at £255-00 after eight bids and the auction still has three more days to run.
I see there is
another one up for auction, starting price £350-00, with currently no offers and the auction ends in a little over 90 minutes time.
4C when I saw that Level Measuring Set, I thought of you.
It is interesting that you mention the 820 Hz oscillator is apparently an arbitrary frequency, for when I first saw it my thought was "that's strange". There were two bids and it was sold for £23-66 . . . but not to you, I presume?