1903 Rod Bayonet Rifle Question

[pete-z]

The sight here is 1 that I have seen. Referred to as " Krag sight, non strike through numbers, without center yardage lines
and with yardage serrations on left side". Pictured on Pg 43 of C.S Ferris " Rock Island Rifle Model 1903".

This Krag sight could be found on a Rod Bayonet but not as issued. Where did you get the picture?