This is Jamieson's Shetland Spindrift in shade #791 which is called Pistachio. This is a lightish dirty olive green.
Shetland Spindrift is a two ply yarn that is classed as 4 ply weight. The yarn is spun from sheep on the Shetland Isles and is ideal for Fair Isle as it is "sticky" and does not unravel when you are cutting steeks. It knits on US #3 needles at 25 stitches over 30 rows for a 4" square. There are 115 yards per 25g ball .
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