Prodigal Son
Senior Retro Guru
Looks like a custom frame from an artisan builder and it looks modern, late 90s.
I can’t see anything similar on the website unfortunately.Could it be a Brew?
https://www.brewracingframes.com/I remember a test in Mountain Bike Action in the late 90's - I'll see if I can find a picture.
Here is the first page of the test in Mountain Bike Action. It is from 2001 - so not true retro
The rest of the pages need a better scan...
The frame in the test seems to have straight seatstays and other dropouts compared to your frame. So yours is probably not a Brew then.