Your gun is a Model 427. Mechanically the same as the 426E, with added Side Plates and Wood Upgrade. In 1971, the 42x Series was being marketed in the U.S. as the GR-2, GR-3, and GR-4. No Side Plate model was offered in the U.S.
The 42x Series guns were introduced in 1963 or 1964 - replacing the 409, 410, 411 Series - and were made until about 1982. The line consisted of the 424, 425, 426, 426E, and 427. The 424 was plain with extractors. The 425 added the Rib Extension Cross Bolt. The 426 was a higher grade with Engraving. The 426E added Ejectors. And the 427 added Side Plates.
The 427 replaced the 411E, and was replaced by the 627EL.
Yours is the first 427 I've seen Case Colors, and the first with a Single Selective Trigger.
Feel free to contact me with questions about Beretta Side by Side shotguns.
Ken Pendleton
931-469-0227
ken@pendletonfirearms.com
