Shipping Date for 1st Colt 1871 .44 RFs

I am researching the Wickenburg Massacre, which occurred on 5 Nov 1871. The perpetrators attacking the stagecoach used Henry and Spencer repeating rifles. There were several revolvers among the coach passengers, which included three civilian members of a military expedition. I am assuming that the revolvers would have been 1860 or possibly 1851 Colts, but am wondering if any could have been 1871 Colt .44 RF conversions.

Anyone know when the first of these would have been shipped?

Thanx.
 
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