Hi, I believe it is an A-21 because the PTO shaft and belt drive pulley are on the left side from the rear but has mounting hardware for a H. The reason it is called an A-21 and the PTO drive is on the left is to line up with the offset PTO on IH A and B tractor models. There was also a C-21 for C and SC tractors but PTO drive was in the center of the mower to match PTO shaft on C and SC tractors. We had a C-21 and later 3pt C-28 model mowers. C-28 was also available with fast hitch.
Photo mounted on Farmall H at: https://www.google.ca/search?q=photos+c-21+ih+sickle+mower&biw=1280&bih=737&tbm=isch&imgil=kl19bgsv5qwDsM%253A%253BWcyH-T2fPJbePM%253Bhttp%25253A%25252F%25252Fwww.chaselinks.com%25252FSuper_C.html&source=iu&pf=m&fir=kl19bgsv5qwDsM%253A%252CWcyH-T2fPJbePM%252C_&usg=__HasE0hMpQXcuJJLejgLB6BUHRzY%3D&ved=0CCgQyjc&ei=v_bLVNr0Ho6nyASShoKICg#imgdii=_&imgrc=7PcZrvk6jQ6AbM%253A%3BV3DhL4CpwpD1ZM%3Bhttp%253A%252F%252Fi45.photobucket.com%252Falbums%252Ff60%252Fjbauer4182%252FTractor%252FPhoto_85476764-1A47-4465-9AD6-C88C0A34BD75.jpg%3Bhttp%253A%252F%252Fforums.yesterdaystractors.com%252Fviewtopic.php%253Ft%253D777387%3B1023%3B767
In the photo, it is identified as C-21 but I believe again it is an A-21 because of offset PTO drive.
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