1955 US Mint Proof Set *Plastic Holder* Proof
Sales Rank in Collectible Coins: 313 (previously unranked)
(Visit the Movers & Shakers in Collectible Coins list for authoritative information on this product's current rank.)
source https://www.lifetechnology.com/blogs/life-technology-holistic-health-products-blog/6-1955-us-mint-proof-set-plastic-holder-proof