If you're looking for photos, there are a number of private purchase/parade Heer buckles pictured in Ben's thread here. They exist primarily in aluminum and zinc, but some early ones were made in nickel as well. The buckles that have a roundel attached via four turned down tabs are what most people are referring to when they say "private purchase" or "parade buckles."
08-25-2014 08:32 PM
Any original Heer buckle with this construction works. If the backing material is blue grey then you need a Luftwaffe buckle. You should be able to find lots of these in the $75-90 price range.