So I have a trumpet that I am selling for my mother in law. One of her kids played it like a decade ago in high school band. I’m trying to figure out exactly what type of trumpet I have and what it is worth. I do not know a whole lot about brass instruments so I need some help. It has the words “Bach Regency” on the top and it has a serial number, but I haven’t been able to find much information on the Internet so far. I do not see any other information on it, but I could be overlooking it because I don’t know what I am looking for. I have found Bach trumpets for sale ranging from a couple hundred dollars to a couple thousand dollars. Any information or help would be wonderful. Thanks in advance.

Serial number is 186071 https://share.icloud.com/photos/0c8jP6wkYQXhrML9mZLJH-vkQ