Amazing aerial photographs can be found here: https://pzgik.geoportal.gov.pl/imap
Using photos from this site we can see how the Przechowko area looked in the 1961. From the photos, we can clearly see where the houses were, where the fields were, etc.
Zooming in on the village center, we can see the cemetery (circled red) and church site (circled green). The quality of the photo is such that we can almost see gravestones in the cemetery. There are two buildings on the church site. In the mid-19th century, the local Lutherans wanted to rebuild the Mennonite church into the village school. In 1857 there was a fire and it's unclear what became of the Mennonite church building. Today, there are a couple remnants of concrete or cinder block foundation at the site.
Elsewhere at this website we can see photos of Jeziorki from 1964:
Schonsee, 1961: (the Frisian church is marked)
Brenkenhofswalde, 1963
Franzthal, 1963
Sady, 1961, Mennonite church and cemetery area marked
1) Get rid of the mapy.geoportal.gov.pl window
2) Click on Photogrammetric vertical aerial photographs/Order photos
3) Create account
4) Select “I will mark photos on map”
5) Zoom the map in to the appropriate location
6) Select year (a green-dot grid will appear if photos are available. Most of the Przechowko/Schonsee/Montau area is covered by 1961. Jeziorki is covered in 1964. Scroll down and click ‘next’.
7) Select a method by which to mark the area, and then mark it.
8) Select the number of the photo or view the thumbnail (miniature)
9) Large scale rendering can then be purchased.
