No GEM crowns in my collection.
I have about 65 World silver crowns, some of the more interesting ones are, (in no particular order):
Belgium 5 Francs, 1872, EF.
Guatemala Peso 1895, EF
Netherlands 2 1/2 Guilders, 1872, good VF.
Straits Settlements Dollar, 1904, EF
Japan One Ten, Year 27, (1894), EF
Spanish Empire Lima Mint 8 Reales, 1756 good VF
Spanish Empire Potosi Mint 8 Reales, 1808 Good VF
Spain 5 Peseta, 1888, good VF
Eyypt 20 Qirsh, AH 1293/31, (1905), VF
Egypt 20 Piastres 1916, VF
France 5 Franc, 1834, VF
France 5 Franc, 1870, VF
France 5 Franc, 1875, VF
Bank of Ireland token 6 Shillings 1804, Fine
Bank of England dollar, 1804, Fine
England Crown, Charles 11 1662, Fine
Great Britain Crown, George 111, 1816 VF
Great Britain Crown, Victoria Young Head, 1846, VF
Great Britain Crown, Victoria Jubilee Head, 1887, good Fine
Great Britain Crown, Victoria Veiled Head, 1896 good Fine
Great Britain Crown, George V 1835 uncirculated
China Tael, Sinkiang province KM45.1, Fine
China Dollar, Hu-Peh Province, VF
China Dollar, Szechuen Province, VF
United States, Trade dollar
, 1877s, EF
German New Guinea Company 5 Mark, 1894. EF. ( inherited
British gradings, I only use Sheldon for U.S. coins.
Perhaps half of these were obtained at public numismatic auction, over a 25 year period.
I also have a few made for collector modern silver crowns, but I don't buy them unless I can get them at below bullion value. That doesn't happen often.