FAQ: I have a compass that looks like your Miner's compass but it has two levels on the inside. How can I obtain more information on it?
It sounds like you have a brass copy of the Brunton Pocket Transit, which we have never made. If it's brass, it's a decorative non-functional forgery from India.
We own the registered trademark "Stanley London" but companies in India have illegally made these pieces. There are no instruction manuals as it is not our product and is a non-functional decorative piece.
The real modern and antique Brunton Pocket Transits were aluminum -- See this page for the current model.