marching compass mk3.The base reads MK3.B-6020.F.B&S(1932) Ltd.the1932 is like a patton date not the year it was made.this one was made in 1943.its made of brass with a mother of pearl dial,to make varios parts luminous (RADIUM) has been used witch is (RADIOACTIVE) so i don't recommend you dismantle an old compass..you never know. And if you choose to ignore that advice don't blame me if you grow a second head:)
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