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[@SuckThisRedditAdmins](/creator/reddit/SuckThisRedditAdmins)
"Awesome thrift store find - a North American Aviation binder from the 50s-70s. It is full of photos of the simulators for The XB-70 Sabrejet X15 B1 and more. Does anyone know what the numbers on the bottom of the photos mean I'm trying to figure out if they are originals or copies"  
[Reddit Link](https://redd.it/1o9m1ed) [@SuckThisRedditAdmins](/creator/reddit/SuckThisRedditAdmins) 2025-10-18T04:09Z X followers, 2644 engagements