Augeredin is right...I really love green peafowl and love to research things about them a lot but I will never be a real expert until I actually have some.
Now with that said, I have done tons of research and learning from people who own green peafowl because I someday want to have pure green peafowl (Javanese or Imperators hopefully). My favorite person to talk to about green peafowl is Reinhold :
http://www.pfauenfarm.de/Home-English/home-english.html
He is very experienced with green peafowl and experienced in telling the difference between a pure green and a high % spalding.
Here is a page on my website that shows an illustration of a green peacock and an India Blue peacock.
http://www.bamboopeacock.com/Green Peafowl Vs. India blue.html It clearly shows the differences to give you a basic idea of what makes green peafowl different looking. With that in mind, Spaldings will normally have too much of a blue shine on their neck. The colors will look off. My advise is if you want pure Javanese birds, use photos from Reinhold's website as an example of what you are looking for. Read Mountain Peafowl has very nice birds:
https://www.facebook.com/pages/Read-Mountain-Peafowl/299476123405814
Here is a GREAT link that will help you understand Spaldings and pure greens better:
http://www.pavo-muticus.com/english/among-breeders/artenvergleich.html
I know I am not a big name breeder and I don't even have green peafowl but I have a powerpoint and 2 word documents full of green peafowl information and photos. I love at least trying to help and be careful because many people sell Spaldings as greens so don't just go with what the seller says because sometimes the seller doesn't even know what they have is not a green it is a Spalding. Anyways I hope this helped some. From my own experience I can say people have tried to sell me spaldings as greens many times. I am very tired of it. It can be hard finding the real deal.
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Another note...AugeredIn mentioned the pair they got were very flighty and did not breed well. Green peafowl can be more difficult to raise than India blues and their varieties but they can be worth all the trouble because they are endangered. I think they are so beautiful I would hate to see them go extinct. Oh and where you live you probably have to provide greens with a heated building for the winter so they don't get frost bit toes.