1857                St. Anthony Street, Near the Post Office, St. Paul, Minnesota.

John Wenzen was recorded in one advertisement that was recorded on January 3, June 13 & August 8, 1857 in the Saint Paul Financial, Real Estate and Railroad Advertiser (St. Paul, Minnesota).  John Wenzen.  Ambrotypes And Photographs, taken in the latest style for from $1.00 to $1.15, at his Gallery, on St. Anthony st., near the Post Office, St. Paul.

John Wenzen is not recorded in other photographic directories.  Recorded in Pioneer Photographers From The Mississippi To The Continental Divide A Biographical Dictionary, 1839-1865,by Peter E. Palmquist and Thomas R. Kailbourn—John Wenzen this is probably the same person.