BS1363 13A plug with BS372 5A sockets.
This provides two 5A sockets while preserving the original 13A socket this would be plugged into.
The front is marked TOTAL 13 AMP MAX.
Solid brass and unsleeved.
The adaptor is marked EMPIRE, NO.1014, 250V.
The 13A outlet is directly connected without any fuse - not an issue, since any plug inserted into it would have it's own fuse inside.
The side 5A sockets are directly connected to the neutral, and line via the 5A fuse.
The BS1363 socket has shutters, opened by inserting the earth pin of the plug.
The other red material is a spacer, used to hold the brass components in position.