If it is a 5 frame it is probably a 10ga but could be a really heavy 12 or a light 8 bore. If it is a grade 2 it should have damascus bbls not stub twist. The number you found may be the order number. Look for a number on the water table of the action, on the forend iron or trigger guard, that will be the serial number. Post some pictures if you can. SN4507 would be a really early lifter and may even be a back action gun
SN14590 is from the other post and it isn't in the book. mfg about 1879, we need pictures...
Good luck,
kurt
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