It packed a large loudspeaker, and was powered by a PP9 battery. It was designed to be especially sensitive on LW.
The R303 was released in 1967 and I bought my one in 1968. The price was around £16. The one photographed I purchased on EBay.
I have adjusted MW so I can listen above 1620 khz for pirates. It now receives to around 1680 Khz.