Thanks a lot, Arwen, for your kind words and also for spending time on my little query. The tajine comes from a workshop in Fes, and all it has is "Fes Naji B" on the bottom. The guys in the shop went out of their way to convince me that this nice piece of pottery was heat resistant and dishwasher proof and that it could cook by itself - you know how this goes

I tested it at 150 degrees C in the oven - it did not crack, although hairline cracks did appear here and there....
So, I guess the smart decision would be to get a plain terracotta tajine for cooking those delicious Moroccan dishes and leave this one for presentation....