While doing a little research on 1973 designated hitters, I happened to notice that there wasn't a card for Tommy Davis in 1973. My OCD would not allow me to let this go un-corrected.
Like Orlando Cepeda, Davis played very little in 1971 and 1972 but his career was revived by the adoption of the designated hitter. In 1973 he played in 137 games, 128 as a DH. He batted .306 which was 3rd in the A.L. By contrast, Davis played a combined total of 120 games in 1971 and 1972.
When you look at the top 5 DHs in 1973 you can see it was populated by stars who's careers may have been over had it not been adopted by the American League in 1973. With 142 games each at DH were Orlando Cepeda and Tony Oliva:
Tommy Davis was 3rd on the list with 128 games at DH followed by Fran Robinson at 127. As long as I was adding the "Designated Hitter" label to his 1973 Topps card, I figured I may as well take advantage of the opportunity to use a picture of him in the correct uniform:
Rounding out the top 5 was Gates Brown with 118 games at DH. Brpwn was the relative youngster of the group at just 34 years old and in his 11th year in the Majors: