I know that what holder a collector wants to use is a personal choice and each has its pros and cons, however, I have never been more pleased with my choice of using Eagle Holders for my mid-high dollar raw coins. I checked my records and I have been using Eagle Holders since 1987. Some of my original collection from that era has been in Eagle Holders and not one of them has developed additional toning, carbon spots or corrosion. I was putting some newer purchases in these holders this weekend and in my stock I found some unassembled holders from my very first order and ended up using them on the coins with no hassles. It seems plastic injection technology has made leaps and bounds since the 1980s, but otherwise they have not changed much in over 20 years. I will agree that it is time consuming to assemble them, making sure the two halves fit together and trimming where needed, then putting the correct sized mylar window in, blowing off any dust with canned air, position the coin with coin tongs, put a thin layer of clear nail polish in the slots and then pressure assemble the two parts. From start to finish, it took me anywhere from 3-5 minutes for each coin, not counting labeling. Anyone else like these? I like the look that the holder has and it allows a large enough window to see the edge of the coin that slabs and other holders don't allow.
