No: 25704/B

This compass is suitable for use as a landing compass for checking small ships  and aircraft compasses. It also can be used as a classic hand-bearing boat compass.

Text on the compass:  Henry Browne &son Ltd.   Trade " Sestrel " mark.   Barking & London

The compass is manufacture mostly from non-magnetic brass and liquid filled to provide card damping over a wide temperature range.  A large high quality prism is used to magnify the card reading and accurate headings are taken through the prism sight line, a sight wire located above the compass card and the object being observed.