Almost all modern serif fonts have true italic designs. In the late nineteenth and early twentieth centuries, a number of type foundries such as American Type Founders and Genzsch & Heyse offered serif typefaces with oblique rather than italic designs, especially display typefaces, but these designs (such as Genzsch Antiqua) have mostly disappeared. An exception is American Type Founders' Bookman, offered in some releases with the oblique of its metal type version. An unusual example of an oblique font from the inter-war period is the display face Koch Antiqua. With a partly oblique lower case, it also makes the italic capitals inline in the style of blackletter capitals in the larger sizes of the metal type. It was developed by Rudolph Koch, a type designer who had previously specialised in to blackletter font design (which does not use italics); Walter Tracy described his design as "uninhibited by the traditions of roman and italic".