Lot of 6 Military DoD SPY Recorder Ampex Reel To Reel Tape #641 Sealed NOS Blank

Description

Lot of 6 Military DoD SPY Recorder Ampex Reel To Reel Tape #641 Sealed NOS Blank.
5” 900ft.
Still sealed and I don’t see any tears or rips in the plastic seals. Boxes are undamaged. No dents in the corners or scuffs
Tried googling the NSN # and the internet has no information on them that I can find. Probably fairly rare item