Hi -
I don't know anything about the breeder. I absolutely love Biewers though. I'm looking to add one to my family soon! It's great how you were able to trace your baby's history. You're very fortunate.
I think the two types of dogs you're referring to are Bieweres and BIROs. I think the difference is that the Biewer was developed by Mr & Mrs Biewer in the 1980s in Germany and that dog as a specific tri-colored pattern. The BIRO is a parti yorkie - also tricolored but not in a specific pattern. Biewers are bred to biewers. Parti yorkies can be bred to regular yorkies. I guess the only real way to tell the difference is thru genetic testing.
I'm glad you found your baby. How did you find him???
Best wishes,
Tracey