U.S. STAMP 1935 3 CENT BOULDER DAM PLATE BLOCK OF 6 STAMPS #774 MNG OG

These stamps are from my parents' personal collection. The stamps are still in mint condition with good gum on the back and have never been hinged. Please review the images of the actual sheet and let me know if you have any questions.

Shipping averages $4.00 for USPS Ground Advantage, would like to split the cost at $2.00 flat fee. All returns are free, and the stamps will be packed securely.