It is a "DS Grade" which was an economy/basic grade, but a very good gun. Mechanically it is almost identical to the higher grades, except it lacks the cocking indicators. There were more DS grades made than any other.

It was probably manufactured about 1913, and the original price was around $40 - a hefty sum in those days.

20 gauge guns are usualy worth more than 12's.

Perhaps someone else may be better qualified to value your gun.

It is a very nice piece. I hope you will enjoy using it.

JERRY