I am amazed, people expecting an item at auction to be working and calibrated but cost tuppence! What world do you live in?
Firstly, PP are an auctioneer, not a test equipment supplier, they may recognise items but really have no idea exactly what they are having never used them.
Secondly, you just bid the amount YOU think the item is worth, no more. I have been astonished at the prices some items have reached, then plus the 40%, people must be nuts.
Thirdly, the person who enters the items for auction states what reserve price they want, possibly a range, and the auctioneere simply follow this instruction.
The curreent multiple sales seem to be from the old company Stewart of Reading, colected over decades, rather like that place in Bradford.
As has been said, buyer beware. But I have bought piles of stuff over the years, as Ramco, with no complaints.
Change to name of place in Reading, finally remembered.