This lens on your pic is definitely the Apo Sironar W 80° 5,6/210 mm.
I can tell you this with 100 procent quaranty.
The 210 mm Grandagon looks total different, has much bigger and longer Lens cells- as all wide angle granadagons have. The 210 grandagon is more than dobble size of these Apo sironar on the pic.
The Apo sironar W 80° 210 m will be great for 8x10 inch.This was the premium line from rodenstock, Schneider made also a 80 ° design that was called Super Symmar HM 80°. Both lenses exist in 150 mm and 210 mm. Schneider made also 120 mm.