European serial numbers JD 450 different from the US?

[Jeroen]

Hello From France,

Last week I bought a 450 dozer with 6 way blade, " made in Mannheim" Germany. With the serial number 450 AC 193731 L Could anyone shine some light on this.........? age? with what this corresponds in the US?

Looking at the outside of the machine it looks like exactly like an A model, but the numbers would say it's a B......??

I really need some specifications like what to grease and where to check oil levels, I don't think it has had any caring in the last decade and I don't want to break anything for lacking of oil.