G., the 28 serial numbers began with a "28", whether a one barrel set or a two barrel set. There are no 20-28 sets. The 28 was built on the 00 frame and the 20 was built on the 0 frame. They do not fit back and forth. The 16-20 set was made from a 20 gauge gun and the serial number begins with a "20". The 28 inch barrel gun is hard to find for sale and sells for more than the 26 inch barrel gun. For future collector appreciation, the best buy is a two barrel set that includes a 26 and a 28 inch barrel set.
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