The only ones I'm aware of to have had a wide-spur hammer are the pre-war National Match guns. The post-war Gold Cups all had flat-sided hammers to my knowledge.
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D. Kamm
USGI M1911/M1911A1 Pistols Website
http://www.geocities.com/M1911_M1911A1
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D. Kamm
USGI M1911/M1911A1 Pistols Website
http://www.geocities.com/M1911_M1911A1