I wouldn't bet on buffalo being more durable than goat.Thank you so much for your reply. I appreciate your opinion. Honestly I always thought about getting the original. Only thing is, that the original is goat and I thought Buffalo is thicker, heavier and more durable.
I'm pretty sure the Bundeswehr thought about what was the best material for their purpose back then. And if that was buffalo, they would have taken buffalo (at least as long as the price was reasonable). Goat looks like new for a long time (which is not everyone's case), is sturdy, and is also okay in terms of weight.
I can't remember how thick the leather was back then, unfortunately. But had I been able to afford it, I would have wanted one back then.