Scale: Unknown. A model of the Acheron made entirely of wood with metal fittings, partly painted in realistic colours with painted and drawn fittings and details. The main hull and conning tower are painted pale grey and the ballast tanks and other details are painted a darker grey. The hull is raked at the bow and its upper edge slopes downwards. The conning tower has two masts and a single gun mounted to its front. There are two stabiliser planes at the stern. Vessel details are inscribed on the underside of the model.