Shawn Armstrong has the kind of last name you'd want for a pitcher. Up there with Josh Outman and way better than Bob Walk. I was able to get a couple cards signed TTM by Armstrong, and both turned out great.
Armstrong (b. 1990) is from New Bern, NC and was a graduate of ECU. He has played in the majors since 2015 for the Indians, Mariners and Orioles. He has a career record of 4-2 with 130 strike outs and a 4.05 ERA. Armstrong appears to be set in the Orioles bullpen for the 2021 season, after a strong effort in 2020 (2-0 with a 1.80 EA).
I mailed to Armstrong on October 30 and got the cards back on November 5, for a 6-day TAT.