Who can break these three encrypted postcards?

In the early 20th century, an unknown person sent three encrypted postcards to a woman in Heidelberg, Germany. Can somebody break these cryptograms?

Encrypted postcards are a frequent topic on Klausis Krypto Kolumne. To date, I have published articles about several dozens of them. Among the most notable are a set of 35 cards written by a musician, a set of 44 cards written by another musician, and a set of 12 cards written by a later pram producer.

Encrypted postcards had their heyday in the early 20^th century (roughly between 1900 and 1925), when the postage was cheap and the telephone technology was still in its infancy. Almost every encrypted postcard I’m aware of was sent by a young man to his loved woman.

Whenever an encrypted postcard introduced on this blog was not already solved, my readers found the solution pretty soon (with only one exception).

Three encrypted postcards from Heidelberg

On a classified ads web site, I recently found three encrypted postcards from Germany. They were sent from Bad Brückenau and Münstertal to a woman named Emma Krumbholz in Heidelberg. I don’t know, who wrote these cards and when they were written, but I’m pretty sure that the sender was the lover of Emma and that he wrote at some time in the early 20^th century.

Here’s the first card (Bad Brückenau is a town in Franconia):

Here’s card number 2:

And here’s card number 3 (Münstertal is a valley in the Black Forest):

I don’t know the solution of these three cryptograms, but I’m optimistic that my readers will be able to break them. I’m looking forward to your comments.
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Further reading: Ungelöst: Vier verschlüsselte Postkarten aus der Zeit der Jahrhundertwende