Ron Guth: The 1897-S Quarter Dollar is found with the mintmark in two positions: one with the S above the space between the R of QUARTER and the D of DOLLAR and another with the S above the left edge of the D. Apparently, the first variety (S between the R and D) is the scarcer of the two. Click on the "View All Images" link to see examples of both.
Sources and/or recommended reading:
"Those Shifty Mintmarks" by David Lange, The Numismatist, September 2010, pp. 21-22
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