Nikon FG Instruction Manual page 54

To keep track of when photos were taken. the FG
accepts the slim. lightweight Data Back MF-15 which
slips on In place of the FG 's regular camera back
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With no sync cord needed Three Imprinting modes
are possible year/month /day (up to year 2100), day/
hour/minute, or picture counting (up to 2000); dis-
played on the data back in clear LCDs and printed,
If you choose. on the photo in unobtrusive red LED
nume ra ls For double-duty as a handy clock , a quartz
timer with alarm function IS Incorporated .
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