I just bought this handsome capital plastic holder with proof sets from 1957 to 1963. The Capital holder was inside of a large zip-lock baggie which allowed a general view of the coins. After a quick determination that there were no spotted or problem coins, I bought it on the cheap (especially considering that there is about $6 in silver and folks are paying 12x today). The real fun began when I started looking for varieties. According to Cherrypickers, there are doubled dies to be found in several years. (Cherrypickers depicts triple & quadruple dies also). I started by looking at the 1961 half dollar reverse and then inspected all of the 1960 dated coins. Remember that the proof 1961 half dollar can include the king of all doubled dies where E PLURIBUS UNIM is strongly doubled. Essentially every denomination in 1960 also can be found with some type of doubling. One of the rarer 1960 cents can have obverse doubling apparent at the date caused by two hubbings with the large date and one hubbing with the small date. Of course, we had to really scrutinize all the quarters, dimes & nickels and inspect for doubling on Monticello. This searching provided a full hour of fun under the microscope. While the looking was good, I’m sorry to report that the finding was bad. I didn’t find any doubling, tripling, etc. on any of the proof coins. During all this close inspection, I found that four of the cents and two of the silver coins included cameo devices and mirrored fields. The two silver coins were fairly obvious cameos along with the 1959 cent. In fact, the 59 cent might be deep cameo. All in all, it ended up being a pretty sweet purchase and I am very happy with it. My plan is to straighten the coins inside the holder & keep it on the wall for daily viewing. Thanks for letting me share & I hope you enjoyed the photos. Let us know if you have had any luck finding doubled dies in proof sets.