A circular brass nautical bearing plate component, manufactured by Alexander Mabon & Sons of Glasgow. The plate is engraved with two concentric scales graduated from 0 to 360 degrees in one-degree increments, with numerical markings at ten-degree intervals. Cardinal point markers for North (N) and West (W) are clearly visible. The maker’s name and location are centrally engraved as ALEX. MABON & SONS GLASGOW. The plate features a large central circular aperture flanked by two smaller apertures, with numerous threaded mounting holes for the attachment of missing auxiliary components. The brass construction shows a combination of natural tarnish and a darkened, blackened finish in some areas. This item serves as a primary structural component from a larger maritime instrument, likely an azimuth circle or binnacle top assembly.
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