Parker Shooter at the GAH
 

This picture is at the ATA HOF in Sparta, but I don't have the caption nor do I know the shooter. Looks to be a straight stock. Very likely a professional rep for Hercules powder.
Ellis F Haak won the 1921 Grand American with a Parker SBT but I don't have an image of him.

https://photos.smugmug.com/Trap-Skee...0Shooter-M.png

Haak photo
 

Here is what I have from the book "The Grand"

Surprised you don't know this guy Drew. It's Johnny Jahn who is in the ATA Hall of Fame. He was a professional shooter for Hercules Powder.

https://traphof.org/inductees/details/1/75-jahn-johnny

Parker shooter at the Grand American

Johnny Jahn was from Spirit like Iowa. So was Fred Gilbert and Bob Allen. All three are in the trap Hall of Fame. Shame on me— I’m from Spirit Lake too and I didn’t recognize him either.

After the 1899 GAH Fred Gilbert switched from a Smith to a Parker
https://digital.la84.org/digital/col...oll17/id/43586
Order Book No. 41 records BH SN 83855 placed into stock in Jan., 1896 consigned to Fred Gilbert. The stock book lists a D5 hammerless, 0 extras, Straight Stock, 12 gauge, 30" barrels, Damascus barrels.

Toward the end of 1901, Gilbert received his new Parker DH SN 103649; no dolls head, no ejectors, 32” barrels, ordered by Russell Klein, Gilbert’s brother-in-law
https://digital.la84.org/digital/col...oll17/id/41367
#103649 went back to Parker for repair in 1902; Order book #59, page 190.

Gilbert, Russell Klein and John Burmister operated the Okoboji trap club in Spirit Lake.
Both Klein and Burmister were accomplished shooters and Klein used a Smith at the 1899 GAH
https://digital.la84.org/digital/col...oll17/id/43586
then a Parker
https://digital.la84.org/digital/col...oll17/id/43599
https://digital.la84.org/digital/col...oll17/id/40027
https://digital.la84.org/digital/col...oll17/id/40273
Klein was a DuPont professional representative in 1908 and was still competing in 1916

Iowa had a number of turn-of-the-century "Top Guns"; in addition to Fred Gilbert “The Wizard of Spirit Lake” there was Charles Grimm, Charles “Iowa Indian” Budd, William Ridley, Joe Kautzky, William Hoon, R.R. Barber & O.N. Ford

Marie Kautsky Grant is in the ATA Hall of Fame. I think she was from Iowa.

Yep, and at some point was using a Parker

https://photos.smugmug.com/Shooters/...0Kautzky-M.png

Did she shoot one of the SC 20’s you claim to have ?