Question about Jones Ware Porcelain Irrigators - Size matters ?

I've seen Jones Ware White Enameled Porcelain Irrigator No. 110, No. 200, No. 210, What different sizes do they make and is there any rhyme or reason to the numbering system? Thanks for taking the time to respond.

A little web search will get you your answer ... style difference

210 http://www.worthpoint.com/worthopedia/2-gal-210-irrigator-jones-metal-113045044

200 http://s.ecrater.com/stores/142924/4fcbe3ffbe566_142924b.jpg

110 http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=161041239470