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@Dutch_Cheese
Clamp: the one with the "arrow" (and Gazelle logo) is quite okay. Haven't seen a single one that failed.
The one on the picture (Marktplaats) is the 1st version, with a smooth transition from braze-on block to tube. That's a weak spot. A crack (?) will appear on the transition in many cases. Sometimes, one half of the black may fall off completely.
Wishbone: seatstays/wishbone separate from seat tube or the seat tube cracks at the junction. Not always, but it was a serious headache in those days.