Sorry if I havent responded to message.
Site having problems....
It is large shank, 5 sized
No specs, sorry
Slightly tarnished ? I dont want to mess with it.....
Plating is near mint though.
Still has tape on the shank to prevent insertion marks
FWIW I use a Greg black NY 5M. Its more open/freeblowing
Gonna get it gold plated soon