KLM-Royal Dutch Airlines-1954 Menu Covers? (5 different) Watercolor Prints

Description

I invite your questions prior to bidding, thank you.
If you are a successful high bidder in multiple auctions,
I will combine shipping, whenever possible.
These are interesting  water color prints of different scenes. I believe, the artwork was created in 1954 for KLM Airlines. I think they may be menu covers, but that is simply a guess since the inside of each is empty. They measure 9.5" by 7" and are suitable for framing. The backs are also blank. There is a total of 5 and they are titled as follows.
They include "The fields near Hillegom where millions of bulbis  flower in spring", "The age old Mint tower in the heart of Amsterdam", "A centry ago there was a large lake here, nowadays this canal boarders a fertile polder", The s'Gravenstenen Bridge at Haarlem one of a kind". and " The picturesque little harbour of Veere".
Some minor signs of use.
Thanks for looking!