Scale: unknown. A model of a 6 cylinder marine diesel engine (circa 1935) made in wood and metal and painted in realistic colours. The engine is painted a uniform grey with painted and plated metal fittings. The cylinders are arranged in two groups of three, on one side of which are circular covers, the other side two large horizontal pipes, one above the other, connecting the cylinders. A geared wheel or cog is fixed to the concealed crankshaft at one end of the model, at the other end is a large, straight-sided tank, possibly a boiler. Emerging vertically from the side of this is a chimney or ventilator, square in section. The model is mounted on a rectangular mahogany baseboard with decorative edges and displayed in its original mahogany-framed case with integral feet. On plaques "Sinclair Model Engineering Co. Model Makers 21 Bishop Street. Glasgow C3" and "6 cylinder "P" type "Sirron" 1200 S.H.P. 245/250 revs marine diesel engine Newbury Diesel Co Ltd Newbury, England.". On model in six places "Sirron".