It is a K prefix from 1969.. It has the tan box with the cut outs...So how would I know if the cylinder(s) that come with the nickled plated gun are orignal to the gun?Most dual cylinder Frontier Scouts were shipped in tan boxes with cut-outs in the bottom for the revolver and for the extra cylinder. If it is a F numbered gun, it will have a sticker on the end of the lid printed in blue and it will say .22 LR and .22 Mag. If it is s P numbered gun ('62 Frontier Scout) the sticker will be printed in black and will say "'62 .22 LR .22 MAG. If it is a K serial numbered gun (nickel plated) the sticker would be printed in red and will say .22 LR and .22 Mag. These boxes did not have serial numbers on them. They were originally packed in a plain cardboard sleeve and the serial number was written on the sleeve. Most of these sleeves were lost along the way.
A few dual cylinder Scouts were shipped in wood grain boxes with black bottoms. In that case, the serial number would have been written on the outside bottom in white marker.
The serial number of your gun (including letter suffix), a more detailed description of the finish and a detailed description of the box would help. Photos would help even more.
- - - Buckspen