Not really sure how rare these are but got them from the U.S. They were made in 1976 and appear to be a combination of Tungsten and brass. What I find slightly curious is the leather darts wallet which has a velcro fastening. Nothing special about that maybe, but in 1976 I cant remember seeing velcro then, I know it was around when I was a little older and everything seemed to have it.

Checked on google and it was invented in 1948 and the patent on it expired in 1978 which is probably why there was an explosion of the stuff in the early 1980's.

Accudart used to sponsor Nicky Virachkul and they even brought their range out in the U.K. in the early 1980's.

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DSCF6718 by dazdart, on Flickr

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DSCF6722 by dazdart, on Flickr

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One of the old boys on my monday night team throws something very similar to this, smooth barrel though. Exact same shape and whatnot though