I don't know if I'd call it a fake; the signature isn't right and it doesn't look like it was 'aged' to the point of fakery, but someone did do a very good job in most other ways. Great job with the lock, too, especially the angles of the pan shaping. Much more realistic than a stock Siler.
I'd really like to know who made this. I wonder if it's one of the 'older dudes' like Jerry Kirklin or Jack Brooks. I don't think Jack would sign it in this way. Someone sooner or later must recognize it, it's a very nice rifle.