Programs have always been my favorite items with my focus on those prior to 1920. Here are 5 from my personal collection that are among my favorites that I have posted before.
1) 1871 Chicago - the City burned down a month after this game was played but this souvenir survived unlike the Chicago team uniforms
2) 1876 Chicago with Spalding pitching
3) 1908 Tigers and 1908 Cubs regular season programs
4) 1918 exhibition program with Ruth on the cover and in the lineup for this game that took place a week after the 1918 world series. Only example I have ever seen.