Deore was originally conceived as a touring group in the very ealry 1980s but morphed into an ATB group in the mid-1980s with the rise of that market segment. ATBs groups typically do double duty as touring groups do their wide gearing and cantilever brakes. The only reason they are called ATB components, as opposed to touring, is because the ATB market is larger.

As previously stated, the flat bar is likely a replacement, but everything else could be original. If you want an identification, you're going to have to post pictures. Having the serial number may also help.