RSR did a 6 1/2 fill lug barrel with a port in front of the sight and fluted or unflutted cylinder in 657-3 and there was also a 657-4 7 1/2 Classic Hunter with full lug barrel and unfluted cylinder. 250 were lightly engraved and marked 1 of 250 but box was not marked (of the ones I have seen. There was also at least 250 made where the gun was not marked but the boxes were. Just what I know and have seen