I would say 1974, to hazard a guess.
I had a 71 with the deluxe interior and same dash ....I am pretty sure that 70 and 71 had the same dash. either standard or deluxe.
Mine never had the wood grain facia around the cluster, the custom emblem on the frame. My 74' did though, who knows, It's a dart.
One could just look at the Vin#, and it will be as clear as day.
Thanks 70 dartmike, you are right with the wood grain, I was referring to the size of the facia, and the glove box facia is larger. As the years went by, the trim got larger. I could be wrong, it has been a long time. Nowadays my darts are 65-69 only. So I'm out of the loop. I do have a 71' Demon, which looks like your 70'.