Census of 12c Dark Violet, Special Printing (Scott 173)
Notes:
Provenance:
- 3/24/1975, Siegel Auction Galleries, 1975 Rarities of the World, Sale 468, Lot 116, Realized $1,100
Certificates:
- PF 6788 (1956) Genuine
- PF 53999 (1976) Genuine with a thin spot top left corner