Designed for Rapitype/Graphic Systems Ltd, 1972. Came in two weights: 55 and 85. [Simonson] There was also a multiline version called Embrionic Triline and an (outlined) Shaded. The bold weight (plus swash caps) was adopted for Berthold Fototypes and is shown in their E3 catalog (1982), with Ilja Feldstein credited as designer. Other sources credit Gary Gillot and use a different spelling, Embryonic [Gillot, MuirMcNeil].
There is no complete revival. YWFT Agostina is very similar and Claude Pelletier released free versions of 55 Swash (used for this sample), 85, and 85 Swash.