A circular brass instrument base plate, likely forming part of a maritime pelorus or azimuth circle. The instrument features a central circular aperture and two integrated spirit levels set into the face. The upper surface is engraved with two concentric scales graduated from 0 to 360 degrees, with the inner dial marked with the cardinal direction ‘W’ at the 270-degree position. The plate is mounted between two brackets of black-painted metal, one of which contains four pre-drilled mounting holes. The brass face is engraved with the maker’s name ‘ALEX MABON & SONS’ above ‘GLASGOW’, accompanied by a star-like device and the serial number ‘No. 1361’.
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