QUOTE(bill @ Feb 5 2006, 10:43 PM)
I use it and many French coins are listed by Roberts number in the US. As with any work of the scope Roberts embraces, it can't take you deep. You don't know if the coin referenced is one of a kind or extremely common. Berman's price guide for Roberts is a help by comparing relative prices.
As my collecting interests have sharpened, Roberts has become less useful and I've had to turn to the specialized, original sources that Roberts used in compiling his book.
CGB rates many of the books they sell by their technical detail and importance (illustrations and readability as well). They rate Roberts technical detail at 2 out of 5 stars and 3 out of 5 stars for importance. Poey d'Avant's catalog of French feudal coins (one of Robert's sources) is 5 out of 5 on both measures. Sotheby's auction catalog for the Farouk Palace Collections rates 3 stars for technical detail and 4 for importance. (Not directly relevant, but a point of comparison for their system.) Sayles ancient coin series rate 2 (technical) and 3 (importance) stars. Sears Roman coins, 3 and 4. RIC, 4 and 5. Subjective to be sure, but I trust the judgement of the CGB numismatists.
Now, if you want to compare what I paid for Roberts and compare that to what I've spent on original editions and reprints in building my French library, Roberts becomes an excellent investment if you want breadth over depth.
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My own viewpoint varies only a tad.
Firstly, it is the first detailed reference written in english and as such, for those who cannot read French, it is probably the single most important book covering the subject area.
As you say, it has it's limitations, not least of which is the way the coins are categorised. It is difficult at first to get used to the referencing system. Some reviewers I know actually slated it when it was first published. However, once you get used to Roberts' presentation of the coinage it does get much easier to follow and use as a reference source.
It covers Royal coins as well as feudal.
As with any subject area the more you get involved, the less relevant the general reference tombes become. Let's face it, if you are an afficionado of US coins, you are unlikely to limit yourself to only having a `Red Book' in your library. If you seriously collect UK coins you are unlikely to rely on Spinks or Coincraft to tell you all.
In the case of French coins, unless you have a penchant for reading French you are going to be VERY severely restricted in your reading materials.
I'm still struggling through my `Lettres a M. Ch. Dugast- Matifeux Sur Quelques Monnaies Francaises (Benjamin Fillon - Paris 1853) covering the money of the Carlovingiennes through to the XVI century. Nice easy (and enlightening) reading ....but in a slow kind of way.
Short and sweet....in my opinion there is no real (or better) alternative to Roberts for a general overview of the subject area (royal AND feudal)....even if you know a little French.