I recently purchased a box of glass slides and metal binders, also in the box were some very thin frames that when folded were the size of the the metal binder. I am trying to date them and determine how these were used back in the day. thanks so much for your help

  • 3
    \$\begingroup\$ Some photo(s) may help \$\endgroup\$ Commented Mar 8, 2022 at 12:45
  • 1
    \$\begingroup\$ Impossible to help without photos. \$\endgroup\$ Commented Mar 9, 2022 at 9:24


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