Powder-Soap-Dispenser Key (8mm sqare hole)

I own a very old Powder-Soap Dispenser made by Sapor in the 1950s. (Most people know them from the toilets in old DB Trains. Later models are still in production). Mine had no key to open it, so i quickly designed one that ergonomically fits between the fingers for a good grip. The key has an 8mm sqare hole and will do a good job as a square box wrench.