William, thanks for your kind words on the articles. The Super 10's are excellent guns. That s/n dates to about 1927. The Grade stamp will be found on the front end of the water table, and on the back end of the barrel flats. F (Field), 1, 2, 3 etc. If you don't have a 10-guage chamber gauge the easiest way to check the chambers is to dismount the barrels, and using a factory 3-1/2" shelll with roll crimp, try to insert the shell. It should not fully chamber. If it does - the chambers have been lengthened. Super 10's weren't designed for 3-1/2" shells. Caveat emptor.
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