dittamedia,
If the notch you are referring to is the one directly behind the barrel flange on the front top end of the chamber, then this notch was a standard manufacturing step during this era to allow the frame/receiver to be used for either a standard issue pistol, or an Artillery Model. The notch was necessary for the rear sight blade/base of the artillery model to clear the receiver in the lowest position.
I hope this helps...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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