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How does one interpret the last digits "10-11"? The ones after the date?
It is a time indication: between 10 and 11.
Somtimes they would use:
Around 1956 the 24 hour notation was mostly used.
These stamps were not only used for the cancellation of stamps, but often used for other documentation purposes
Post office officials, as state employees, could certify the content of a letter and would used this stamp on the copies that could then be presented to a court.
- Stamp head of a hand stamp (fist stamp, hammer stamp, self-inking stamp), day stamp (Tagesstempel) Lübeck 1, 3-4 PM
Small style stamp used until 1956 (1964 in East Germany)
Larger stamp used between 1956 and 1962 with 24 hour notation
Larger stamp used between 1962 and 1993 with postal code at the bottom (Deutsche Bundespost, West).
- Around 1981 with added 0's (1000 instead of 1)
Here they are being used in a postal saving book
Larger stamp used between 1965 and 1993 with postal code at the top (Deutsche Post, East).
Larger stamp used since 1993-07-01 with 5 diget postal code
Sources: