Clarence McArthur Autographed Memorabilia. Check out Clarence McArthur Autographed Envelope - PSA/DNA. This Envelope that has been personally hand signed by Clarence McArthur. This item is approximately 3.5x6.5. This was signed in 1934. It has been authenticated by PSA/DNA and comes encapsulated in their tamper-proof holder. PSA/DNA is the leading third-party authenticator in the autograph industry. This product is the perfect collectible for any sports fan or memorabilia collector. Commemorate the great career of with this autographed item, or check out other souvenirs at SportsCollectibles.com for more products autographed by. When it comes to Entertainment Memorabilia, SportsCollectibles.com offers a wide selection of autographed memorabilia. Product will ship in 1-3 business days with free shipping on orders over $200. Buy with confidence as this is an authenticated autograph.