Was looking at a .22 Browning semi auto. It is fairly heavily engraved (squirrels etc. on left side and groundhogs etc. on the right). The top of the receiver is also engraved. All the browning ATD's I have seen with this engraving are Grade ll and have a nickel/silver receiver. The one I was looking at has a BLUED receiver. I have been unable to find another grade ll with a blued receiver. I'm guessing it's a late 1950's or early 1960's gun with the thumb wheel sight.Can anyone help with this? Has anyone seen a Grade ll with the blued receiver? Best regards. Unit 70