This cutaway is a piston from a World War II era P&W R985 engine.
The cutaway area has been highlighted with red enamel paint. This has been loose mounted on a semi-circular oak plinth so that it can be removed and handled as this is a nice tactile item.
Would make an ideal desk ornament for an aviation enthusiast.
Size 13cm diameter. 10cm high. 6 cm deep Weighs 1kg.