The NGC Universal ID is a four digit alphanumeric that groups coins based on a unique combination of date, mintmark, denomination and striking process (MS, PF, or SP). These IDs are a simple organization of all coins prior to variety attribution and grading.
Jeff Garrett: This is probably the most magnificent coin to have ever been produced. The coin was designed by Augustus Saint–Gaudens who was America’s greatest living artist at the time. Unfortunately, the coins were impractical to strike and these patterns are all that remain of the initial efforts by Saint–Gaudens. There are about 14 or 15 examples known. The first coin struck has a plain edge. The die was cracked and replaced. This example first surfaced in the incredible set offered in the early 1908s by Stack’s as the Colonel North set. Some experts speculate that the set actually came from the Charles Barber family. Two are known with inverted edge lettering, one of which is lightly circulated (can you imagine). The Smithsonian collection contains three examples of this fabulous issue. Most of the known examples are superb, with the finest coins graded PR 69. I have often stated that it’s a shame that 1907 Ultra High Relief Double Eagles cost so much. Every collector would own one if it were possible.