Wall Street Auction #XXI, Sessions 2 and 3

ABNC Proof Vignette sheet of 2 Blocks of 4 Different Modern Presidents. NY. ND (ca.1970's), Portraits of Eisenhower, Kennedy, Johnson and Nixon in 2 blocks of 4 different portraits. The imprint on the plate has printed in reverse "Longine Symphonette Society - Presidential Vigs" and plate number. Evidently this was some sort of gift or premium of Longines. Specimen overprints and ABN imprints below portraits, printed on thin white card. AU to Uncirculated. ABNC. Scarce.