If I remember right, my Mavic D321 CD ano, 32-hole rims weighed ~680gr. ea.
What exactly do you mean by a Nevegal 2.3 fitting without trouble? As in, the tire being too wide or too narrow? It will easily fit a little narrower(2.1 would be the extreme limit IMO) and a much wider tire than a 2.3 without issue. The rim is 36mm wide if memory serves me correctly. I have used 2.2 kevlar and 2.35 steel beads successfully in the past. Excellent rims by the way, super durable.
Edit: Oh yeah, these rims are now known as the EX 729 model.