Need help identifying ford 555 year

[Apollojmr]

Hello I’m new and have a 555 that I need some help Identifying the age. Here are all numbers I can find. Any help is appreciated.


C407001

C5NN7006

C169477

55011J

7C22

6M21C

 

[seville009]

https://www.ehow.com/how_7891730_year-ford-555b-backhoe.html

The 6m21c number appears to be the one to use
- December 1986

 

[Roadworthy]

Here's a bit more info: TractorData.com Ford 555 backhoe-loader tractor information