I am not sure of the purpose of the mould numbers.

	They may simply indicate a mould at a particular time. This would allow quick knowledge of a damaged mould.
	They may indicate a mould at a particular factory. On a buying trip in 2006 I purchased several of these juicers. I purchase 2 amber juicers in regional Victoria which both had mould number 8. I purchase 1 amber, 1 green and 1 clear juicer in regional South Australia which all had mould number 12. This appears too significant to be a coincidence.

The layout of the number is inconsistent, however they are read from the base of the juicer.

I have only found mould numbers on amber, green and clear glass juicers.

(This is an image of the juicer with mould number 4)