If you ask which tomato ketchup is best? You will probably get the answer 'Heinz Ketchup'. I am sure this answer won't even surprise you. So by holding the same view, you must have noticed two numbers in a smearing position over the front of Tommy K bottles and the rest of its products as well.
Well, the reason you are thinking of having these 2 numbers over the glass bottles is not the same as it is actually meant for.
So, the actual reason is:
Smooth rolling of ketchup liquid from the bottle.
Which is not the same case with other ketchup bottles that are without 57.
We love it too!