What an experience with Catawiki. Just bad. Send in 3 lots, being postage stamps MNH, full year 1952, it was refused because I asked a minimum price. Another lot with numbers 36 and 37, the experts say that there were doubts about the authenticity. However, bought them through Kaiser, the reference for certificates. Another lot were minerals and this lot was refused without explanation. All lots are sold through 2nd hand and eBay. Costs 0.11 euros per advertisement. Moral of the story: There are so-called pseude experts who are playing lottery. These are probably people who do not know anything about their business. The biggest criticism, however, is the auction cost. Can you imagine that the seller pays more than 15% and the buyer pays almost the same amount. To me this is a pure scam.