I just bought a stainless steel Mark 1. According to the serial number (15-85333) it was made in 1979. Until I saw this gun I thought the earliest SS models were made in the mid - late 80's. I called Ruger to ask about the gun and the CS person said she could not find any record of SS models made in 1979 and it must have been a special run. Any one know anything about it?