15.8 shown on both barrels which in MM = .622 inches. It looks as if GA for gauge is stamped after it in one place and above it in another. Twenty gauge is somewhere around .615 so my guess is a little bigger than what we know as .615 for a 20. The 76 MM would equal 2.992 inches so again it probably means 3" chambers. Have the chambers, chokes, and bores measured to see what you have.
The one star on the left barrel may indicate Full, and the three stars on the right may indicate Improved Cylinder. Obviously with a serial number on the flats.
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