S designation on Parker Guns

[John Allen]

Jim,Good to know you are still fooling around with good guns.Could the S be a mark to indicate that the gun was restocked by Parker?In my years in the business I have seen a few with the S stamp and all were restocked.

[edgarspencer]

I'm certain you noticed in the serialization book, that the s designation does NOT show up prior to approximately your gun, and yet there are many in the short number of following pages. Perhaps you'll get lucky and an owner of one of the others will pipe up and then you can compare notes.
My first thoughts went to 'STOCK', then 'SINGLE' and lastly 'SPECIAL' i.e. special order. Maybe just someone new in the office for a short period of time.