My copy of the Michel Privatpostmarken catalog is a little old, but the Hannover city post stamp is listed as #1B, issued in November 1886, and priced at 2 euros unused. So not uncommon.
You also have a city post stamp from Helsinki (Finland) in the second picture. That's not listed in the Michel catalog, but you might be able to find out more by Googling the Helsinki city post.
The other stamps are common postage stamps from Transvaal, Rhodesia, and Finland.
The dark brown Finnish stamp is listed in my old 1986 Norma catalog as an 1884 Helsinki local post. It looks to be "dark brown on blueish-grey" so it is #8b with a catalog value of 22 Mk. This translates to around 4.50US if I remember correctly.
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