That's too expensive. OK to be fair its difficult to sell anything very cheap on ebay as there will be around a quids worth of fees on that but still its not good value to the buyer.
Beware of believing pictures as well. There won't be many sellers who have old stock left of the ones with Pat. on. Quite a few will still have the old style round ones though and any seller who shifts a few will now most likely just have the new style in stock.
Do keep in mind that the new style affords better grip as well as preventing rolling.
If you still want an old one I'd advise looking
here and then mentioning to the seller that you'd like an old, old school variant
Warning, I am incredibly biased in suggesting that
There have been four different variants of the screwdriver over the years. Ninjaz has them detailed on his
site.