Everyone has nailed the answer to your question. Roy Baker was a true craftsman and innovator in the leather holster business. Most major manufactures have copied his design to some extent. My only comment on your holster is that it appears to me to have originally been a 'brown' finish and someone has blackened it. Roy's original black didn't fade like that. ....

My first holster obtained for concealed carry of a Colt Gov't Model is a brown Roy's Pancake. It is now 45 years old and I still use it when carrying a Colt 1911 is my choice. .......