You could get one if you place a custom order.
about 1883
1877
A Colt single action 1860 army with that serial number was made in 1866.
depending on condition $1000 plus or minus
Your colt single action army dates to 1881 with the serial number you provided.
If it is Colt single action army, then it was made in 1889.
eBay
If this is a Colt single action army, it was made in 1874.
Need to know what the gun looks like,barrel length,grips,etc. its a cap and ball about 8 inch barrel black wood grip
Look on the frame
We need you to define "effective" and "6 gun". If you are asking the maximum effective range of a Colt Single Action Army revolver, sometimes called a six shooter, it is about 50 yards.
My records indicate that your 45 colt single action army was made in 1883.