(San Francisco): Image Leather, no date. Small card measuring approx. 15.5cm by 12.5cm. Yellow card with leatherman image and black text. Text gives handkerchief pocket and colour codes. It is thought that the modern hanky code started in New York City in late 1970 or early 1971 when a journalist for the Village Voice joked that instead of simply wearing keys to indicate whether someone was a “top” or a “bottom”, it would be more efficient to subtly announce their particular sexual focus by wearing different coloured hankies. Other sources attribute the expansion of the original red–blue system into today’s code to marketing efforts around 1971 by the San Francisco department store for erotic merchandise, The Trading Post, promoting handkerchiefs by printing cards listing the meanings of various colours. The card here is from the San Francisco leather store 'Image Leather' and is in very good condition.