This absence in the original list is explained by the brokers' ignorance about the Cantemerle sales price. Actually, Cantemerle had maintained a long-standing trading relation with Holland: the entire production was sold directly to Dutch buyers, thus by-passing the brokers and merchants in the Bordeaux wine market. Guillaume Lawton remarked on this practice of direct export in 1816, commenting that "(Villeneuve is in) the leading position in this parish. His wines fare well in Holland and he ships them there". The brokers, therefore, knew next-to-nothing of the details of transactions between Villeneuve Durfort and the Dutch (in particular, the prices at which his wine sold). However, since the property was one of the principal producers in Macau, the brokers tried to keep track of Cantemerle as best they could with the little information they had at hand. In the records that were habitually kept in minute detail by Guillaume Lawton and his successors, the entries relating to this property were largely limited to the number of Bordeaux casks produced and, for those years in which no other information was available, the entry simply reads 'Holland'. On a few very rare occasions, the selling price was noted but, in general, entries relating to Cantemerle were conspicuous by their absence (for the eighty years from 1775 to 1854, only six prices were recorded).
For the 1854 vintage, Caroline de Villeneuve Durfort made a decision that represented a significant break with the past - Cantemerle wines were henceforth to be sold on the Bordeaux market through the traditional network of brokers. For the first time in thirty years, Tastet and Lawton recorded a selling price for the estate in their books - 2,100 francs for a tun. This was 100 francs more than Croizet-Bages, the last on the list of estates featuring in the brokers' classification, definitively drawn up on the 18th of April. That is not surprising if we know that Cantemerle's wine had procured prices equivalent to the fifth growths for decades. The price of Cantemerle recorded by Tastet and Lawton in 1825 was 1500 francs a tun - that is, the same as for Croizet-Bages.
In 1819, Cantemerle sold at 850 francs - 100 francs more than Croizet. The previous year, Croizet had come out on top at 1000 francs against only 710 for Cantemerle, but in 1815, the difference was much smaller, with Croizet-Bages at 950 francs and Cantemerle at 850. And, in 1775, prices recorded by Guillaume Lawton were 300-330 for Cantemerle and 270-300 for Croizet-Bages.
As soon as Caroline de Villeneuve Durfort learned that Cantemerle was not on the list presented at the World's Fair, she reacted. In order to maintain the reputation of her estate, she demanded that she be included amongst the fifth growths, not by approaching the Chamber of Commerce, as others did months afterwards, but by going directly to the source - the brokers' union. Doubtless armed with a historical record of Cantemerle's selling prices that was far more complete than that held by the brokers, the dossier she officially submitted was apparently irreproachable.