bjr,
Not sure if you found the information you were seeking last year. I just seen your post while researching my Hay Rake. I do have a McCormick - Deering No.5 LW and it almost looks exactly like yours; and I too had to add bearings (pull one out and take it to a local steel and bearing company) they can match them, I had to get 35 of them as mine only had 13 in it. The rear end of your rake is what makes yours different. This is what I found and your rake photo design matches from what I can tell.
Cock shut lists the rake you have from what I can see in the photo as a : Black Hawk T-7 Side Delivery Rake (1951 and up, owners manual) Manufacturing Division Bellevue, OH & Shelbyville, IN. As of the date of this posting, ebay has a manual for the rake listed. Hope this helps.