KLM Royal Dutch Airlines BOLS Delft Blue House Miniature houses, popular on KLM Royal Dutch Airlines long-haul international flights since the 1950s. They used to contain gin, but are now empty. Box: None Long-term storage at home. Please consider if you understand this and if you are looking for a specific number. I looked it up, and one seems to be No. 12? but I'm not sure. I couldn't find the number for the other one. Please be careful to avoid purchasing the wrong item.