1 oz Gold Bars. Proof & Mint Sets. Proof Set (Hard Plastic Holder) – SKU#154477. Photos in this listing may or may not be stock photos. The photos are meant to be an indication of the product you will receive. Made by the U. Style of holder may vary. Continue your proof set collection by adding this 1952 U. Proof Set to your cart today! This is not a photo of the actual item. 1,359 Item as described. Item exactly as shown! Rec’d item, looking forward to doing business with again.