This splendidly industrial spirit level is made from hardwood with a steel top, attached with what looks like brass fixings. The steel is stamped "British Make 3091" and looks like it might just have the remnants of the original label on the back. It's rather tricky to date as there's no brand, but by the look of the square level and brushed steel top it's most likely 1950s.
It measures about 8" long, by about 7/8" wide and 3/4" tall and is long and thin with squared off ends. It's in rather nice condition with only a bit of wear, but then I'm sure it's had a long and fruitful life!
This would make a lovely addition to a mancave or shed - it's really tactile, and a very nice old bit of wood. Plus it would fit very nicely in a Christmas stocking!