San Francisco Mintmark Styles
for the
Liberty Walking Half Dollar

MMS-001 Blocked serifs with dot in upper loop	Years of Service
	1916 1917 (Obv.)
Photo courtesy of Heritage Auctions
MMS-002 Small	Years of Service
	1917 (Rev.) 1918 1919 1920 1921 1923 1927 1928 1929 1933 1934 1935 1936 1937 1939 1940 1941 1942 (20% of mintage)
MMS-003 Large	Years of Service
	1928
MMS-004 Trumpet Tail	Years of Service
	1942 (80% of mintage) 1943 1944 1946
MMS-005 Straight Serifs	Years of Service
	1943 1944 1945
MMS-006 Ball Serif, with flat spot on lower ball	Years of Service
	1945 1946

Red= Ex. Rare, Blue= Rare, Pink= Scarce