Description
- Scott Catalog # : 3906 - 3909 / Colorano Silk First Day Covers.
- Set includes: 3906 Barbara McClintock / 3907 Josiah Williard Gibbs / 3908 John von Neumann and 3909 Richard Feynman.
- Brilliant full-color art, dazzling gold borders, and the unique look that only a "silk" cachet can offer, have made COLORANO the choice of knowledgeable collectors.
- ARE IN MINT, UNADDRESSED CONDITION.