Large Vintage Boat Propeller three blade brass wall decor 18" - Nautical Decor

VINTAGE, LARGE, BRASS/BRONZE, BOAT PROPELLER 18"
Marked 18" x 21P(or 20?), R & is 1-1/4" Bore tappers to 1"
Columbia Propeller Co.
APPEARS TO BE IN GOOD CONDITION(SEE PICS) BUT I TRULY DON'T KNOW IF YOU COULD USE IT ON YOUR BOAT WITHOUT REFURBISHING?
GREAT NAUTICAL DECOR OR GARDEN PIECE