Pocket flat compass 3", vintage old style military compass nautical pocket shiny brass British prismatic compass navigational instrument. A basic and functional design is often desirable in a compass and this pocket flat compass design neatly fulfills that need. Its 3" diameter means it fits in any pocket and it is very readable. -Basic, functional design. -Very readable. -Sturdy and durable. -Dimensions: L: 3.75in x W: 3in x H: 0.5in. -Weight: 0.02lb.