Herb,
These are COMMERCIAL guns, numbered in the commercial manner. There is no number on the extractor or the middle toggle link. The number I am refering to is on the REAR of the breechblock, next to the slotted end of the firing pin retainer. You have to remove the toggle train, and flex the breechblock down against the pressure of the firing pin spring to see it clearly. It is on the opposite side of the slot that the firing pin sear rides in, on the rear of the breechblock.
<img src="graemlins/nono.gif" border="0" alt="[nono]" />