As can be seen by comparing pictures in this thread, there was a time this Sherman was "fenced in" and a a time when it was more freely accessible. It had its turret traversed to the rear and it while it was located close to Hotel Hartenstein, in a different location as can be seen in this picture postcard (also from
http://www.geldersarchief.nl/) - if you look closely.
I would guess it was first left where it stood when found around the time the civilians came back to Oosterbeek after the liberation in 1945 - note that after Market-Garden Oosterbeek was evacuated by the German Army.
Then when the surroundings were cleared up a little by little from 1945 onwards, the Sherman apparently was moved, it's turret traversed to the front and a small fence added.
In 1949, when the Airborne Museum was established in Kasteel Doorwerth, the Sherman was moved there. But in 1978, when the Airborne Museum moved to Hotel Hartenstein, the Sherman was moved back to where it was found in 1945.
