As Red Sox lover and mild baseball historian, I found this collection that just hit Goldin Auctions to be of significance:
https://goldin.co/item/vintage-signe...eeds-authsi7tp
Tris Speaker
Joe Wood
Harry Hooper
Duffy Lewis
Eddie Cicotte
Buck O’Neil
Hugh Bedient
Steve Yerkes
Clyde Engle
Les Nunnemaker
Pinch Thomas
Larry Gardner
Bill Carrigan
Ray Collins
Neal Ball
Marty Krug
I thought the letters from Yerkes (On Revere Hotel Letterhead) and Clyde Engle (Yale University Baseball Team Letterhead where he was the coach) are particularly interesting. I’ve never seen an assemblage of the 1912 Red Sox team like this ever.