Ron Guth: As with the 1893-S Quarter Dollar, the 1894-S 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. Examples of both can be seen by clicking on the "View All Images" link.
Sources and/or recommended reading:
"Those Shifty Mintmarks" by David Lange, The Numismatist, September 2010, pp. 21-22
© 1999 - 2015 Collectors Universe NASDAQ: CLCT