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Richard MassonBob commented that a printed price guide is obsolete the moment it is printed, but as MikeU implied, what may be useful is a price report that reported actual transactions on a timely basis. VCP is linked to eBay and covers all major auctions. A minor shortcoming is that it is search driven- you can't see a price unless you are looking for it- but a monthly or quarterly summary of actual prices paid would be interesting and useful. Who knows if they even "own" the data for resale in a different (printed) format.
MikeU also pointed out that the gap between post-war and shiney is underserved. I think SCD ceded this area to Beckett and that their new forthcoming publication will attempt to exploit that.