Hi Kat
The only reference I have for these is 'The coinage of South
Germany in the thirteenth century' by D.M.
Metcalf, published by
Spink in 1961. He shows 103 different
types for
Vienna, and says that the
standard work was 'Wiener Munzwesen im Mittelalter' by
Luschin, 1913. He adds that an extension is F. Dworschak, 'Studien zum oesterreichischen Munzwesen',
Numismatische Zeitschrift 1920, pp.53ff., plus articles in NZ 1926, 75ff; 1932, 37ff; 1934, 57ff. and 1931, 51ff. There may of course be more recent books/articles of which I am totally ignorant
.
Your coin would appear to be Metcalf's no.615, described as having a harpy on the
obverse and a facing royal
bust in an arched
border on the
reverse (the reverses are often very weak, like yours), and attributed to
Albrecht I, 1282-1308.
Best wishes
Alan