Olds Register Photo Guide-

Fullerton

Question 6 Serial Number on Spring Barrels?

In addition to the serial number being stamped on the middle valve casing, the serial number is also often found on the valve piston spring barrels. To locate this, unscrew the top cap from the valve casing and remove the entire piston assembly. If the serial number is stamped on the spring barrels, it can be seen under the springs.