My favourite bread by far is what my family just refer to as "German Bread" (seems to be a common preference for Breads from Germany in this thread).
Have only really found the 'genuine' article in, not surprisingly, Germany. Tried various different shops and the closest I have found is at Waitrose from, IIRC, 'The Village Bakery'.
As far as I know it is a Rye Bread and a heavy bread. And one notable difference is it just doesn't go mouldy! unlike the typical bread load made by UK and loved by consumers that go green in days, the "German Bread" I like just doees go mouldy, just goes hard eventually.
So if anyone knows where to buy (or how to make?) this bread it would be mega! A picture below of what the sort of bread I am talking about looks like ...