I know your type #3 Gill Sans

Eric Gill studied under the renowned calligrapher, Edward Johnson, the designer of the London Underground sans serif typeface. This influenced Gill who later experimented with sans serif designs, and in due course produced a set of capital letters. These became Monotype series 231, produced in 1928, and the forerunner of the extensive Gill Sans font family now available.

Gill Sans is a twentieth century sans serif that has a simplicity of form which does not reject traditional forms and proportions, and gives the face a humanist feel. The lighter Gill Sans fonts remain highly readable in text and suitable for magazine and book work, whereas the heavier weights are best used for display in advertising, packaging and labels. The light and medium Gill Sans fonts are good for text and all weights look good in display work. [Hat Tip - Fonts.com]