It is not a GR2 or GR3 (I have a GR3). The articulated trigger, coin finish, engraving pattern, POW/splinter, sling swivels, and lack of a crossbolt mark it as a 425, probably for the European market (I also have a 425). The wood is generally interchangeable among the GR2-GR3-425-426 guns.
Please look at the gentlemen's picture again, as it does have a crossbolt, as clearly you can see the extention on the barrels. The cross bolt on the GR2's are internal and DO NOT protrude from the receiver. Your 424,425,426 do not have this third bite. Also my 424 in 20 gauge does not have a crossbolt, nor does it have a splinter foreend. It has a semi beavertail. And the 424-426's were made after 1977. His date code is 1968.
Bob
