Collector forums like community-fountainpen.de or penexchange.de are not designed to deliver sales information for free, because no commercial interest is to be served there. Anyone needing the market value or exact model data on such finds should turn to a recognised expert like Stefan Wallrafen (collectiblestars.de), who researches and estimates against fee. Before such a commission, weighing whether the expected sale proceeds even justify the research costs is worthwhile; often this is not the case.