Check the face of the unidentified Cylinder. Look for 3 electro etched numbers, you may have to look real hard even with a magnifying glass. If it happens to be a Magnum or spare cylinder for the Single six, the 3 numbers (if it has them) will be the last 3 digits of the single sixes serial number. This would make it a factory matched cylinder.
I have never owned one, but I thought the Bearcat cylinders had the Bear and Cat engraved on them ?
Check the face of the unidentified Cylinder. Look for 3 electro etched numbers, you may have to look real hard even with a magnifying glass. If it happens to be a Magnum or spare cylinder for the Single six, the 3 numbers (if it has them) will be the last 3 digits of the single sixes serial number. This would make it a factory matched cylinder.