but I can be traded for other paper ($375/ €300) or mother of pearl plaques (French style from Europe).

Real Aero Club de Cataluña, Spain Barcelona. 1916

These cardboard plaques come in five denominations being 50/ 100/ 500/ 1000 and 5000 pesetas.
Four color variations are known being dark green, orange, red and purple.

This is the complete dark green set.
On the chipguide you can find a partial set of red ones starting with CG238284.
These are a must have in a collection of rare plaques.

Enjoy. Jo from Belgium.