For sale locally is a blued 2.75 inch early Security Six with fixed sights with the original early style grips. I didn't know Ruger made a "fixed sight" Security Six, but it does say "Security Six" on the right side of the frame. Does anyone have a guess as to when they were made, and when they switched to the current grip shape? The gun has a little wear, but they are asking $375 which seems a fair price, makes me tempted to get it. Is there any real scarcity or collectability to this early versionl? Any thoughts/opinions are welcome!