This appears to be a type of banknotes called Notgeld. There were many types issued after World War One. Cities, states, companies, etc. would print these for use in the inflationary period after the war. There is too much to learn about the time period and the effects of notgeld for me to put here, but it is quite interesting and you should do some internet research on it if you are at all interested in it. Do be aware that there was A LOT of it printed and there were A LOT of issuers. As such, most of it is worth little even today. In the condition of your note, probably nothing unless it is extremely rare.
This note is from a little later in the period of issue, and I could not find your exact note, but I did find a seller offering them from this town here: http://www.apcpapercollect.com/kellerpq.htm
Also check out this site: https://notgeld.com/grossgeld-1918-1921/what-is-notgeld