Tikithindi
Sorry - by CV I meant catalogue value, as expressed by Gibbons, Scott etc. Most post-war stamps carry auction estimates (real, not
ebay, auctions, that is) that are around 10% of CV. As Jenny says, there will be exceptions for particular stamps or collecting areas. Plodding through a catalogue in your local library would give you a good starting point to work down from.
Good luck!
Geoff