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@Rik_Van_Looy
Excuse the upside image
They look like Simplex Rigidex 30 & 35 - Patents filed in 1951 / 1953
http://www.disraeligears.co.uk/Site/French_Registered_Design_44011-001_-_Simplex_Rigidex_30_files/French%20reg%20design%2044011-001%20Simplex-filtered.jpg
http://www.disraeligears.co.uk/Site/French_Registered_Design_46818-001_-_Simplex_Rigidex_35_files/French%20reg%20design%2046818-001%20Simplex-filtered.jpg