Old Mercury Racing Prop? w/pics

[Mas]

What is it for? I picked it up at an estate sale because it looked cool!

The prop number is 1221-8

Size is 11 1/2 x 28

http://i129.photobucket.com/albums/p219/mas421/P1000786.jpg

http://i129.photobucket.com/albums/p219/mas421/P1000787.jpg

http://i129.photobucket.com/albums/p219/mas421/P1000788.jpg