150 is a dark blue from the Luca-S Mouliné range, a pure Egyptian cotton thread also used in many Luca-S and Letistitch kits. The 8 m skein has 6 divisible strands: usually 2 strands for cross stitch on 14-count Aida, 1 strand for outlines, 3 or more on coarser fabrics. The colour is fast and the thread can be washed up to 90°C or dry cleaned.
The table shows the matching DMC and Anchor colours given by the manufacturer, handy if your chart uses another brand or you need to finish a kit. Below are the closest shades, useful for blending or for replacing a colour.