The early 66 ND came with a stainless rear sight which was later changed to black as complaints glare prevented a good sight picture. The red ramp was available on the 66 ND. My 2.5" 66 ND was purchased new with red ramp as was a 6" which I no longer have.The Model 66 no dash did not come with a red ramp front site. Front and rear are made of SS,no dove tail cut out with a plastic insert. I believe the red ramp started with the 66-1. I have looked at pictures on Gun Broker of Model 66 no dash, SS front without the red ramp, Thank you for all of your responses.