The Greek rainbows have the Alpha or Beta symbol under one foot (or even two feet) in some cases! I can't if remember if the rainbow and pegasus ponies have the Alpha and Beta symbols too
The CP and sitting pose adults, as well as all babies should have nothing under their hooves. In some cases ponies are found with trace or even clear marking under their hooves. It is because when the moulds were made, the Hong Kong mark wasn't properly erased. This is why this mark sometimes looks rubbed or is only partly visible.
You can use other features to be sure of a ponies country of manufacture, this can include; colour and texture of the hair, colour and texture of the body, scent, the type tail washer used, the number of rows of plugs, forelock or lack of forelock, the eye style and colour and finally the symbols.
It's good to research nirvana ponies before you start buying, it will give you a better idea of what they are and what to expect and not to expect.
There are plenty of pictures in the nirvana gallery too
http://mlparena.com/archive/gallery2/main.php?g2_view=core.ShowItem&g2_itemId=20319Love pkw xxx