I found this beautiful lantern on an auctionsite. The lantern itself was in very good condition, only the bottom of the fount has 3 large cracks. I decided to replace the bottom. Sealer and solder was no option. The pump looks like a Tilley pump and was easy to clean. All the seals are replaced by new ones.
That's a very good find, Johan, and a great repair on the tank. I note that the pricker/control has a lever, rather than a wheel (the example of @Nicola Francesco Elia, here). The lever appears on another Benz model of @Andreas Peuker here. Cheers Tony