In general, when the earlier, older bottles were being manufactured, it was quite common for them to vary somewhat in exact weight from one to the next.
Is Number 3 plastic safe? The numbers on the bottom of the bottle are 04 and below that is 78 can anyone tell me what these numbers are thank you.
If the plant has not printed the date on the base, it can be found on the neck or label of the bottle.
Look at the neck or label.