This altar was donated to the Minnesota Historical Society in 2007. It was displayed as part of their celebration of the 150th anniversary of Minnesota's statehood.
This altar is currently installed at Our Savior's Lutheran Church in Grygla, MN
I'm not certain of the location of this altar, but it may be installed at St. Petri Lutheran Church in Grygla, MN
This is Johann's final and most impressive altar. It is located in the Marshall County Fairgrounds in Settler's Square. Settler's Square is the county history center managed by the Marshall County Historical Society.