Here's a random card that I pulled from my boxes and was able to send TTM. Horace Speed doesn't have many cards at all, and this was the only one I had. He signed in a ballpoint pen.
Speed (b. 1951) played in the majors 1975, 1978 and 1979 for the Giants and Indians. He had 28 hits, no home runs and a .207 batting average.
I mailed to Speed on October 18 and got the card back on November 30, for a 43-day TAT.