Books/Learn chess well, part 65 messages

Came across this booklet in the attic and was shocked by the catalog price. Is this really worth that much, can't find anything about it anywhere else on the internet. Anyone more info ??

think that when entering the price, the price has been entered with zeros and forgotten the comma.

I already thought something like that on the basis of other parts. may I immediately ask how a catalog value is checked?

no value is checked. The usual method: is it realistic compared to other comparable booklets and even then nobody knows everything. When I see someone putting up mini books and asking € 15 for everything (in good condition) and for a few € 125 then there is no reason for me to doubt the accuracy. If you see that regular reference books cost € 5 and one from the same series costs € 500, then I am going to have my doubts and ask the importer for information. If there is no answer to that, then simply change the price to € 5. Even you can make a price suggestion for this, there is a link with the price, with which this is possible.

clear story, thank you