Originally Posted by Martz
The die is a bit bigger from a month of use? Or they expect it to be x head size after x use, without checking what it was in the first place?
Now a cynical person might say... perhaps the demand for tins badged up as 4.52 is higher than it is for 4.51's so they just stuck a 4.52 label on the bottom of the next batch they churned out to meet demand (since the number is pretty meaningless anyway)
Of course.. we know that they change die design without changing die numbers.. so it could just be that they swapped the die but kept the die number the same between the two batches.