Help in identifying this Austrian stamp. Some kind of Revenue stamp from 1919. Thanks in advance!

Frank Sagstetter

Scott Payton

It's a share registration control revenue stamp. Appears in both green and red.
https://www.hipstamp.com/listing/austria-1919-rare-mnh-share-registration-control-revenue-stamps-blocks-r32063/36217984

Frank Sagstetter

Thank you very much for your reply and identification of this unusual item. Appreciate your help!