Late 1960's Acid Blotter 900 Squares

Late 1960's Acid Blotter sheet. Sheet measures 7.5 x 7.375 and is perforated into 900 squares. EX+/NrMt condition. Unframed, loose and not glued or mounted. Buyer must view photographs or scans to assist in determining condition and ask further questions if so desired. Provenance: Washington collection. We ship most items in this auction in house and gladly combine shipping if possible of multiple items.