#stampfriday
Otto Baumgarten
* Přerov *
Husova č 1697.
found in an edition of collected works of Lessing from 1882.
https://lootedculturalassets.de/index.php/Detail/objects/16182

Otto Baumgarten is not a rare name, and we have no information on how and when the book entered the stock of @zlb_Berlin, so the key to identifying him should be the mention of Přerov, a small city in Moravia, near Olomuc.

An initial search yields no definite matches, at the excellent Arolsen Archives for example, there are 12 records of 9 different people, but none with a relation to Přerov
https://collections.arolsen-archives.org/en/search/?s=otto%20baumgarten

At http://holocaust.cz  there's only one Otto Baumgarten: Born in 1909, deported from Prague to Theresienstadt in 1941 and from there to Auschwitz in 1944. Still no mention of Přerov, but could it be him?
https://www.holocaust.cz/databaze-obeti/obet/76032-otto-baumgarten/

It is! When checking the attached images of documents we see this Otto Baumgarten was born in 1909 in Bilsko, in the district of Přerov:
https://www.holocaust.cz/databaze-dokumentu/dokument/411659-baumgarten-otto-nezpracovano/

We also find out the names of family members: His parents were Jindřich Baumgarten and Kornelie Müller, his wife was Helena Sabudko:

Also, now that we know his date of birth, we can find him at the Ghetto Theresienstadt Card File at Arolsen:

Looking for other people with the name Baumgarten, we can also find Markéta/Margareta Baumgarten:
https://www.holocaust.cz/databaze-dokumentu/dokument/411645-baumgartenova-margareta-nezpracovano/

This s Otto's sister, born in 1910 in Bilsko. We know this because the names of the parents are matching up, even though Kornelie is here referred to as Nelly:

Markéta was executed in Prague in 1942. Her spouse Arnošt Lorenz, Jindřich & Nelly Baumgarten were murdered in Theresienstadt in 1942, Otto was murdered in Auschwitz. The family tree we can build for now is visibly severed by the Holocaust:

But this is ongoing, there's still a lot to do and there's hope - we do not yet have information on the fate of Otto's wife Helena, and there's a Page of Testimony for Otto at @yadvashem from the 1970s.