That looks exactly like my friend's machine, but it had the 6004 manual. Those mounting towers don't look as nice as the newer ones but they work great. Another friend of mine has those towers but with the new base clamps, 6004 circa 2004.
BTW my friend who has the same machine as you got it for $350, in So Cal. Anyone buying could probably buy the QA clamps for $150, then it would be worth $500 easily. Basically a 5003 with better mounting towers.