A subreddit that might be able to confirm what plane a window is from?

I have an antique plane window with a backstory of it being from a B17, I cannot confirm the story and wanted to see if I could figure this out. However most common info finding subreddits say I "have to much info" and "i already know what it is in general so i cant post it there".

I just want to know if it is actually from said aircraft and potentially where it would be used.