Just found a three-screw Super Blackhawk that has an original steel ejector rod housing. I've owned a couple old Flat-top Rugers which all came with steel housings but only the earliest Super Blackhawks came with steel housings. Serial number is 10XXX. That seemed like a high number to still have the steel housing but this one looks original. Anyone know what the year or serial number range was when they switched to aluminum?