I wrote the article in The Double Gun Journal, it was a two-part in two different issues.  Observed serial numbers run from around 1000 to a bit over 7000.  There were lots of parts and guns in-work sold at the time of the receivership in 1904.  In the 1900 Model the A- and B-Grades were essentially the same plain guns, just the A-Grade had twist barrels and the B-Grade Damascus barrels.  When the 1902 Model came along the B-Grade got a bit of line engraving and they added the 16-gauges to the offerings, the Trap Gun and the D-Grade.  To date only two of the Trap Guns have surfaced, the one I showed in my article and the one pictured in McIntosh's Fox book.  They are consecutive serial numbers in the 318x range.  I've recorded more D-Grades!!  Both of the Trap Guns are restocked, mine better than the other and I have the remains of the original stock.