This package contents: 
Significant early history about the company
40 exclusive diving prints on archival paper suitable for framing
Early Schrader helmet photos in color
Information on how to date on a Schrader helmet
 
About the prints:
    -   Complete set of 10 Mark V helmet drawings
Helium helmet 
1916 Schrader prototype photo and drawing
1898, 1912 and 1917 Schrader knifes
Early Schrader air pumps
Many Schrader helmets, from 1898 to 1941 including 4 & 5 bolt helmets
Many other Schrader drawings
All are professionally printed
 
This package is excellent reference material!