RickC said
Can anyone advise what year or when Winchester “stopped” stamping the Pat date(1901) on the 1A/1B/1C elevators ?

  

Hi Rick,

Good question!

I looked at the Winchester drawings for the 1A, 1B and 1C and there is no mention of the omission of the patent date in the drawing revisions.  The drawing revisions on my drawings only go up to 1935 though so it is possible it was dropped after that, or it could have been dropped earlier and just not mentioned, although in all other sight drawings the omission of the patent dates were indicated in the revision log.

Hopefully someone else has the definitive answer as I am now curious myself.

Best Regards,