This is a lot of 12 empty miniature houses made by BOLS Holland for KLM. These houses are part of the KLM Blue Delft's collection and are collectibles related to aviation and airlines. The houses are in the shape of Dutch buildings and are likely made of ceramic or porcelain. These specific houses were likely given out as a promotional item by KLM.

House numbers are: 1, 8, 15, 21, 26, 27, 46, 51, 68, 69, 89

Small crack on house number 68, see picture.