This is a massey-ferguson landini belt, o/d width 51.500 in; inside diameter width 0.250 in
No other part numbers with same form, fit, and function found.
NSN 5920-01-090-4363
NSN 5895-01-336-8582
NSN 5935-01-458-4845
NSN 5910-01-395-2052
NSN 5998-00-117-4566
NSN 6150-01-129-5216
NSN 6620-01-575-9561
NSN 5930-00-409-5100
NSN 5965-00-285-0745
NSN 6620-00-278-7313
NSN 5990-00-578-3215
NSN 5895-01-465-2039