(Click for full photo)
1901 - 1910 Sunbeam oilbath halfmoon shield Sunbeam oilbath halfmoon shield (patent 1905)
Photo Courtesy of Norman Miller, Pa. USA.
This illustrates Sunbeam patent no. GB190515493 , the "half-moon shield" (This patent no. appears on the oilbath itself in its earlier form 15493/05)
and also, perhaps, GB190827189, the bolt-on oil-bath - the words "patent" and a number below can just be made out on the perforated chainstay to the left of the crank, though it does not look like the right number.