[feets]

Here's an interesting tidbit from Ruger. They list the start dates for the serial numbers online. The first Redhawk produced in 2013 wore 503-65138. 2012 started with 503-63809.
My gun is very close to the 2013 starting number. The label on the box says it's a KRH-45, not a KRH-45-4 like the current 4" variants.
Ruger has not made 7-1/2" guns in 45 Colt since 2007.

KRH-44 5001 44 Rem Mag 7.50"
KRH-44R 5003 44 Rem Mag 7.50"
KRH-445 5004 44 Rem Mag 5.50"
KRH-444 5026 44 Rem Mag 4.20"
KRH-45-4 5027 45 Colt 4.20"

Mine is catalog number 5023. perhaps it was a distributor special.