I always look at frames like this as original, unless there are obvious signs of a repaint or such. So I'm going with the assumption it is a Mercier made from Columbus tubing which appears from the remnants of the sticker to be Aelle.

It likely is worth something to a person wanting a quality singlespeed or fixed gear frameset. The downtube shifter bosses are a negative in that regard, but can be covered by the Problem Solvers bits.

I agree with Randy in that if I were looking to build up a rider this wouldn't be the frame with which to do so.