Because of above, i googled "remborde". This is a BIAS link i am sure but it does teach me about leather and what to look for:
http://ankhstrap.com/leatherpage1.html
5 pages...good reading...again, i am sure bias (against cheap Chinese stuff). Page 5 is the best.
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So basically, all leather are waterproof to a degree...but all cow/calf leather let in water after a while. Air dry. The only band that is truly waterproof are those that are covered with a compound to prevent water from ever touching leather part, such as silicone.
So, i am interested in how Di-Modell does the waterproofing. Given its economical price, i wonder if they are using some sort of silicone compound.