Looking for some information as to what a sprocket that I have is or was used for.  I have an axle sprocket made of cast that came off an Oliver 60.  It is approximately 11 1/2" across outer tooth to outer tooth, with twelve teeth. Each tooth is approximately 2 3/4" apart center to center.  The two halves clamp on axle with two 7/16" carriage bolts.  It is faded red in color and carries a different casting number on each half-  CP-1550 and CP-1551.  Can anyone tell me as to what implement it might have been used for or with?  I can only guess that it was something that possibly needed to run at a different speed maybe than ground wheels on implement?  Or was this the primary drive for an implement either mounted or pulled?  Does anyone have pictures of this in use? Or in a parts book?  Thanks for assistance.