Zerostat: Old is Gold?


I was recently in the market for a Zerostat gun.  I looked online and saw that they had moved their production from England to China.  Of course, without any reduction in price.  As I try to avoid Chinese manufacture as much as I can,  I thought I would buy a used one on ebay.  I bid on a few auctions but was surprised to see them selling for around $50 for one in decent (but hardly new) condition.  The new blue Zerostats from China are $80 and up. 

Are the old Zerostats in some way superior to the newer Chinese made that would justify the (IMO) relatively high prices being realized for the original guns?
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Do you seriously think anyone knows whether a new Xerostat made in China works any better or worse than one made in England a decade or longer ago? A scientific comparison could be made, but I doubt that it has been made.  I await other responses.
It is surprising what people know, and I would have thought that the whole point of a forum such as this one is to share knowledge. I don't really see why you need to be so rude to the OP in your unhelpful response.
I bought a Zerostat blue which I presume to be made in China over here in the UK a few months ago and it works just as well as the one I first bought 40 odd years ago. Oh and the price was just 42 pounds so I think someone is making a killing somewhere. I must also say that I buy lots of things for my computer direct from China and on average I pay about a third of the price as buying on E Bay. Again someone is doing well at our expense and I have no notion of giving up buying from China.
You should check out ali express for CDs  and SACDs.  Some great discs to be had at super prices.  Many discs they offer there I have been unable to find elsewhere!