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 purchased 2 amber juicers in regional Victoria which both had mould number 8. I purchased 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. Additional to this is that the orientation of the pip collectors (teeth) and the pouring spout differs.

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

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