If this is the same Deer Master sold by Lancaster Archery, it's made in S. Korea by Samick. Samick's main focus is target bows. They build top end target recurves that are used by many international competitors. I think their website is samicksports.com.
Could be another "Deer Master" entirely but the two bows look identical to me. Lancaster sells it under the company name "Chiron" (pronounced Kiron), while 3R's is "Great Tree".
Supposed to be a decent entry level production bow.
IMO, watch the Trad Gang Classifieds for a used Chek Mate Hunter II or Hunter I. Spend a little more and get a lot more for it...