Extra digit under trigger guard
 

Have a #1 frame gun that needs a new buttplate. The one that came off had a “1” on the inside. The stock has a “0” forward of the serial number under the trigger guard. Does the “0” denote size, and if so, would this mean that a replacement buttplate should be a 0 instead of a 1?

The 0 is the grade. The 1 is the buttplate size.