I couldn't tell you that, all I can tell you what I know which may be right or wrong from stuff I have heard/read on the net etc.
The rifles were released to dealers with a recommended price, from what I gather, a lot of people considered this price to be rather high for what was essentially an Airsporter 'S' with an elongated stock as per stutzen but whereas the stutty was beech, the Centenary was walnut. The rifle came with 'extras', none of which were considered 'exceptional'.
I gather that some were initially snapped up by collectors whereas others languished in dealers for some time until heavily discounted, I heard of a couple of people who picked up some 'bargain' buys eventually.
Approximately a quarter of the production run were .177, the rest were .22. I have the exact number somewhere but it's on my other computer.
The chap I bought mine off had a few, one of which was a .177 which he had intended to keep until I believe 'a chap from Scotland' managed to persuade him to part with it for as best as I remember £1,300.
Personally, I prefer .22 cal (as mine is) but there are some who will pay a premium for a .177 and they are 'rarer' as fewer were made.
What they go for these days depends upon condition and what someone is prepared to pay - obviously!
Personally, I wasn't bothered about not getting all the extras with mine, but I did get the bag and the certificate, the rest I have replaced with possibly superior items or close replicas of the originals.
I believe I have another Airsporter that was made in smaller numbers than the Centenary, but I may be wrong!
You pays your money and you makes your choice - good luck!
(P.S - if anyone knows better than this, I would also like to know! )
ASM