Case Cheetah folding lockback

[Narragansett]

I have a case Cheetah #6111 1/2L from the 60's when I was a teenager. I have tried to look up the value, but value goes by dates , color and pattern numbers from what I can see. I also do not know the difference between red bone and pretty bone which appears to have a reddish tint. Up to 1964 seems to be one class, and then there are classes by date features and numbers after that. I am not trying to determine a value here, just establish a date for what I have. I know I bought it in the 60's, and I would have been 15 in 1964, so it is very possible it is from that class or group of knives indicated as something like 1940 to 1964. How do I figure this out?

 

[ExRanger714]

The dot system came around 1970 but maybe here may help:

W.R. Case College - Tang Stamps

Good luck!

 

[Narragansett]

Thanks, all figured out. 1965 to 1969. Estimated market value 400.00. Thank You

 

[jsfricks]

True red bone is from the 40’s and 50’s, where in its truest form is found only on XX or Tested knives and it’s color is thought to have been caused by a particular dye that Case was using at the time. A true red bone should have the front handle the same tint as the back handle. Knives that have been displayed in sunlight sometimes fade to a red color but one that is usually dull and doesn’t match the back handle. This is t true red bone. Many USA and Dot knives have red handles that would be the true red bone if they were on a Case XX. These knives are valued slightly higher than knives of the same pattern handled with regular bone. The first picture is green bone from the 30’s and the second picture is red bone from the 40’s-50’s.