Hello, thanks for writing. I don't know if I can help but Bundow and Sydow (or Sidow) are names I've found in the records of Beelitz, Kreis Pyritz (records microfilmed by LDS church). Beelitz was just a few miles from Woltersdorf, Kreis Greifenhagen (records apparently destroyed in/after the 2nd World War.) I have Sydows in my lineage in the early to mid-1700s. The Bundow related to my family was August Friedrich Bundow who is believed to have married Louise Duchow in 1844. At one time the family lived in Kortenhagen. Your Ferdinand would be a little younger than August Friedrich and could have been a brother or related. Do you know where he settled in the U.S.?
Feel free to contact me at: gidget398 at att.net
Bonnie