Haliaeetus leucocephalus - American bald eagle - dried, with attached feathers and some ceremonial wool strings, from an immature male, weight 258 grams.
The sample was from a section of the wing starting at the proximal end of the metacarpal - where the carpal bone sits. This was from a now returned collection of artifacts that were in the Saint Michaels Historical Musuem. Males are smaller then females.
So this value is for most of the feathers and thin bones plus dried tissue. Some feathers were damaged. I helped catalog a collection about 40+ years ago,
http://www.stmichaelshm.org/history.htm
What the heck are you trying to do? And why do you not connect with somebody at the Smithsonian who can probably give you real data? If it were me,
I would not use this data for anything except interest.