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The Stevens 520 pump shotgun was first sold in 1904. It had a square-backed receiver. Your Model 620 is a streamlined version of the 520 and was introduced in 1927 and was sold until discontinued in 1955. There are no production figures and I know of no way of pegging your model within its time frame, short of studying Stevens advertising for details over a period of time. Yours would definitely not be a trench gun. Perhaps you know, but if you don't you will be interested to know that the 520 and 620 were designed by John M. Browning, America's greatest gun designer. That in itself demands respect for this model. They were offered in 12, 16, and 20 gauge.
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