The Model 12 Winchester was their first hammerless slide action shotgun. In 51 years there were over 1,900,000 sold. All Model 12's are takedown versions. It was made in several different styles.
The Standard Grade in 12, 16, 20, and 28 gauge with plain, vent rib, or solid rib barrels in 26", 28" 30" or 32".
The Feather Weight has the same barrels as the Standard and an alloy trigger guard. The Riot Gun has a 20" barrel in 12 gauge only,
Trench Gun has a 20" barrel with a heat shield and bayonet lug.
The Skeet Grade was made in all gauges with a 26" barrel and checkered stock and extended slide handle.
The Trap is in 12 gauge only with a 30" barrel, checkered stock, and checkered extended slide handle.
The Heavy Duck Gun is in 12 gauge only with a 30" barrel and a solid red rubber recoil pad.
The Pigeon Grade is custom built and engraved.
The values on the Standard Grade are:
excellent-$1200, very good-$800, good-$600, fair-$500, poor-$200.
Add 20% for solid rib, 30% for vent rib and 40% for milled rib.
Deduct 10% for 16 gauge,
Add 20% for 20 gauge, and 600% for 28 gauge.
Add 20% for 32" barrels,
Add 30% for original box and papers.
I hope this helps you,