AKA baker hills........
I would assume the numbers on the tags are in order starting with 1 being first produced. But I don't really know that for sure.
The 7000 series tags are on the transmission case.
The 6000 series tags are on the transmission cradle.
Here are mine....
225/hustler -0098
st300d -0332
208tt -0619
st300d -1484
Just interesting.