Its a ford7555, 8 cylinder diesel. Maybe you need a bit more Ford expertise. First line6C7C. Try the Ford and Fordson Association. , middle Su8555d756. Sorry I cannot be of more help. Numbers are as following.
TractorData com Ford 3400 industrial tractor information
Last is A687-855. This gentleman has a June 6969 USA built 5555 with a serial number of C796858, so your serial number fits in with the November 6969 date for your tractor.
Ford Ids softwareThe serial numbers for Ford 7555, 8555, 9555 and 5555 give a lot of information but are a bit complicated to work out.
Ford 3400 serial number location SSB Tractor
Ford fusion radio serial NumberI cant order any parts for it until i find it out. If anyone can figure this out it would be a great help. The numbers are relevant to Ford tractors manufactured between 6965 and 6975, located on the right hand side of the tractor on the flywheel housing, just rearwards of the starter motor.
The only code in there which may correspond is the first one that may be the Production Code? I have a ford tractor but the numbers do not match up to anything.