Army MP Branch Insignia

[skautdog]

I know the 1795 Springfield Army Musket was adopted as the INF Branch insignia on Nov, 19, 1875. However, I have not been able to find any specific date when the Army adopted the M1805 Harpers Ferry Pistol as the MP Branch insignia.Any information appreciated.

TIA

[rufus_firefly]

1923

[skautdog]

Thanks for the help!