The Deutsches Institut für Normung (DIN) has issued other diving-related Standards, one of them DIN 7876 of October 1980:
Tauch-Zubehör; Schwimmflossen; Maße, Anforderungen und Prüfung (Official English translation:
Diving accessories for skin divers; Flippers; dimensions, requirements and testing). This is a useful Standard for those who decry the lack of uniformity in sizing fins, both full-foot and open-heel. The Standard contains a table stipulating which foot width applies to which foot length when designing the dimensions of foot pockets. For example, the Standard specifies that the foot pocket for a foot length of 275 mm, which is in the shoe size range 11-13, should accommodate a foot width of 110-115 mm. I have an old pair of Dolfino Marino fins embossed on the sole with the data
DIN 7876-A. FL. 275. FB. 105.
This tells me that the the German Standard 7876 applies to the fins, they are full-foot fins (A=full-foot, B=open-heel), the foot pocket's foot length is 275mm and foot width 105mm. A foot width of 105 is smaller than the recommended range (110-115), so the pocket will be narrow-fitting, a feature of many Italian fins of the time. It's a pity that more fin manufacturers don't follow this Standard, which would help people work out which size of fins would be the best fit for their feet.
Incidentally, an English-language version of the Deutsches Institut für Normung website can be found at
Deutsches Institut für Normung : Homepage EN
and an English-language Wikipedia article about the organisation can be found at
Deutsches Institut für Normung - Wikipedia, the free encyclopedia