[galfarragem]

Another specialist Berlin shop to the list (modelmaking/art materials and tools) and very famous amoung architects:

https://www.modulor.de/en/store-berlin/

[microtherion]

My sister works there. It's a very nice store, but I wouldn't describe it as hyper specialized. Maybe more of a general stationery/art supplies store, but with a lot of extra depth in some areas (architectural supplies etc).