I just bought another Krag sporter.  This is a disturbing trend for me.
Anyway, when it was sporterized a dovetail for a rear sight was cut right where the rear-most rear sight screw hole is located.  It seems to have been done with some precision using a dovetail-cutting end mill.  What's unusual is the size.  I measure about .540" front to rear rather than the standard 3/8" you usually find.  Was this a standard size at one time?  Any ideas about what aftermarket rear sights will fit?

Here's a pic of the dovetail:
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