Let's take the tag apart a little at a time. There's usually truth there, but it's often buried in mislabeling.
Milt Natal is Miltonia Natal,
which is Milt Bluntii x Milt Purple Queen. That sounds like one of your parents.
The other parent is a bit trickier. If we work with just Milts, you've Milt Lake Ida and Milt Lakelight as possible parents. Neither have been awarded, so there are no AOS registered cultivar names
which I suspect 'Purple Leopard' is.
If we expand the search to anything in the Onc alliance, we then have:
Odm. Lakiniae
Oda. Lakonia
Again, there are no awarded cultivar names. Check your tag and see if either of those are close.
You might find this thread helpful on deciphering names, although screwed up tags are still wickedly confusing!
http://www.rv-orchidworks.com/orchid...ead.php?t=4163
McJulie