Hopefully this chart will help better illustrate the three print group 1 team changes.
Print Group 1 subjects could have been printed with up to 12 different backs.
-Brown (Chicago) was the first team change. It was changed to the Brown (Washington) variation after the PG1 cards concluded the 150 Series printing and began being printed with 350 Series backs.
-Dahlen (Boston) was the second team change. It was changed to the Dahlen (Brooklyn) variation after the first two backs of the 350 Series were printed. These two backs were Piedmont 350 and EPDG.
-Elberfeld (New York) was the last team change of the three. It was changed to Elberfeld (Washington) in the later stages of the PG1 subjects being printed with 350 Series backs.
-I added Bresnahan (Portrait) on the bottom to show a comparison of the three team changes to a regular PG1 subject.
-It's important to point out that in some cases both variations are possible with Piedmont 350 and Sweet Caporal 350 backs. As stated earlier in this thread these backs were printed multiple times during a print groups production.
If you look at the two team variations for each of these cards as one subject, I believe it shows they were printed like the other print group 1 subjects. They just had a team change along the way.