1936 B-16 with aluminum alloy undercarriage
"I believe they were only produced from 1933-35. 
Mine was on a 1936 RRA that I purchased."
Karl Kimbel, Klunk Bicycles and Repair, Columbia, MO

Brooks B-17 1951 Cycling Magazine ad

The webmaster's 1930s B17

Model "Sprinter" (circa 1940s-50s?)
     

Model B-45

Model B-57, circa 1952

An older, yet NOS, Swallow and a newer version at Interbike 2003

More goodies displayed at Interbike '03

       

Late 1990s production tan B-17 saddle...
And Proofide treatment (old style can)