Good list. I would add time period. In general baseball photos from the 1860s are rarer than from the 1890s which are rarer than from the 1940s. Anonymous baseball player photos from the 1850s-60s are valuable just because baseball photos in general are rare from that early.
Rare processes should get a premium (platinum prints, salt prints, Daguerreotypes, ambrotypes, ortones, other). This is often because the processes are rarely seen, historically significant and/or especially aesthetically pleasing. 99% of baseball photos are the standard processes (albumen (1800s), gelatin silver (1900s), tintypes, c-prints (standard modern color process), so this aspect rarely comes into play.
Last edited by drcy; 04-28-2014 at 12:55 PM.
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