One Old Dakshnavarthi Shell(Shank) is there with all your required specifications. But it has extra features... It is very big in size (Am sure you didn't see such one before), its outer shell covered with Pure silver (as it was used worshipping Goddess Lakshmi) and it is pure Indian Variety Shank. But I'm not sure it meet your buying price as its so highest as per its history, usage and rarity. Leave ur email-ID if you want to see the pictures.