Direi che in particolare la medaglia è riferita all'anniversario delle nozze tra Joseph von Colloredo-Mannsfeld e Maria Thresia von Lebzeltern: la medaglia è dunque databile al 1891. Qua sotto la genealogia tratta dal sito di Paul Theroff, An online Gotha (
http://www.angelfire.com/realm/gotha/go ... oredo.html):
1c) JOSEPH Franz Hieronymus Fst von Colloredo-Mannsfeld (Vienna 26 Feb 1813-Vienna 22 Apr 1895); m.Vienna 27 May 1841 Maria Theresia von Lebzeltern (Vienna 27 Apr 1818-Vienna 19 Jan 1900)
1d) Hieronymus Ferdinand Rudolf Gf von Mannsfeld (Przemysl 20 Jul 1842-Blankenberg 29 Jul 1881); m.Prague 29 Apr 1865 Aglaë Gfn Festetics von Tolna (Tolna 2 Feb 1840-Vienna 1 Jun 1897)
1e) JOSEPH Hieronymus Rudolf Ferdinand Franz Maria Fst von Colloredo-Mannsfeld (Prague 17 Feb 1866-Paris 21 Feb 1957); m.1st Paris 18 Apr 1903 (div 1925) Lucy Jonquet (Surrey 24 Jan 1878-Rome 11 Apr 1940); m.2nd (civ) Rueil 21 Oct 1925 (rel) Paris 3 Apr 1941 Marie de Smit (Omerville 10 Jul 1877-30 May 1973)
2e) Johanna (Dobris 27 Jul 1867-Brünn 26 Aug 1938); m.Vienna 23 Apr 1887 Aloys Fst von Schönburg-Hartenstein (Karlsruhe 21 Nov 1858-Hartenstein 20 Sep 1944)
3e) Marie Therese (Dobris 5 Aug 1869-Vomp, Tyrol 27 Feb 1960); m.1st Vienna 25 Apr 1892 Karl Gf von Trauttmansdorff-Weinsberg (Vienna 24 Mar 1864-Preßbaum 4 Jan 1910); m.2nd Prague 5 Aug 1911 Adolf Gf von Trauttmansdorff-Weinsberg (Friedau 22 Jun 1877-k.a.Jaroslawice 21 Aug 1914)
4e) Hieronymus Hubertus Franz Alfred Ernst Maria (Dobris 3 Nov 1870-Prague 29 Aug 1942); m.Vienna 10 Aug 1909 (div 1926) Bertha Gfn von Kolowrat-Krakowsky (Teinitzl 21 Jun 1890-Auch, France 29 Jan 1982)
5e) Ernestine Karoline Marie Timothea (Dobris 24 Jan 1873-1961); m.Miletin 11 Sep 1909 Maximilian Steinlechner (d.Vienna 10 Jul 1937)
6e) Ida (22 Aug 1875-16 Aug 1887)
2d) Karoline (Vienna 24 Feb 1844-Mühlbach 27 Sep 1916); m.Vienna 25 Nov 1872 Josef Gf von Gudenus (Mühlbach 31 Jul 1841-Mühlbach 17 Aug 1919)
3d) Ida (23 Aug 1845-5 Apr 1914); m.21 Aug 1877 Leopold Frhr von Gudenus (d.1913)
4d) Franz de Paula Ferdinand Gundaccar (Vienna 1 Aug 1847-Sierndorf 22 Oct 1925); m.1st Prague 23 Jan 1874 Maria Frn Lexa von Aehrenthal (Doxan 26 May 1850-Volosca nr Fiume 5 May 1881); m.2nd Groß-Skal 6 Sep 1884 Elisabeth Frn Lexa von Aehrenthal (Prague 2 Mar 1858-Sierndorf 29 Jul 1890)
1e) Marie Felicia Theresia Elisabeth (Sierndorf 24 Jul 1875-Vienna 29 Jul 1959)
2e) Rudolf Josef Ferdinand Maria (Sierndorf 16 Aug 1876-Sierndorf 21 Mar 1948); m.Schloß Sichrow 20 Sep 1922 Johanna Pss Rohan (Sichrow 16 Jul 1890-Vienna 15 Mar 1961)
1f) Maria Johanna Ernestine Bertha Sylvia (Vienna 25 Jul 1923-Arnstorf 28 Aug 2010); m.Sierndorf 19 Apr 1969 Anton Frhr von Aretin (Munich 15 Aug 1918-Aldersbach 12 Jun 1981)
2f) Agnes Maria Felicia Franziska Johanna Judith (Sierndorf 5 Dec 1924-Peapack, New Jersey 17 Aug 1970): m.Vienna 15 Sep 1956 Friedrich Wilhelm von Meister (London 19 Jul 1903-Peapack 6 Jul 1978)
3e) Ferdinand Johannes Hieronymus Maria (Sierndorf 5 Jun 1878-Vienna 18 Dec 1967); m.New York 10 May 1909 Eleonore Iselin (New York 27 Dec 1881-New York 25 Feb 1939)
4e) Isabella Therese Josephine Aglaë (Volosca 20 Apr 1881-Vienna 7 Sep 1972)
5e) Franz de Paula Gundaccar Alois Hieronymus Elias Maria (Sierndorf 11 Oct 1885-Vienna 12 Feb 1935); m.Mariazell 15 Apr 1931 Marie Gfn von Walderdorff (Wels 7 Mar 1891-Ensegg, Upper Austria 17 Aug 1973)
6e) Aglaë Elisabeth Marie Therese (Sierndorf 12 Dec 1886-Vienna 17 Feb 1964)
7e) Elisabeth Maria (Sierndorf 15 Jul 1890-Vienna 5 Oct 1979)