I think have one of your bad examples attached below.

My quick un-statistical survey got around 25% being pointed wrong/backwards.
Attachments
1957 3100 right correct 1.jpg (50.03 KB, 247 downloads)
1957 3100 left correct 1.jpg (20.59 KB, 248 downloads)
1957 3100 right correct 2.jpg (85.92 KB, 244 downloads)
1957 3100 left wrong 2.jpg (34.3 KB, 245 downloads)
1957 3100 left wrong 3.jpg (37.88 KB, 241 downloads)