Gents, thanks for your replies.
JohnZ, yes I had read the "M" code paper.
I am wondering then in this case, what do the #6 & #8 digits indicate? ie" M68
pjibizjak, I did mention that at
best this could be a May block, then it could be correct for the stamped date of 0510, I don't know where June came from?
This could be a January block for all we know but obviously it must be made before the stamped date.
Just trying to work it out fellas and I appreciate your help, thanks.