John Wayne's Wine

[wondersofwine]

This may not help much but if you go to this website: http://www.graperadio.com/archives/category/discussion/ and download the podcast from GrapeRadio about HiTime Cellars, it supposedly talks about John Wayne's drinking habits. (May not even cover the Cabernet Sauvignon you have in mind and probably costs to subscribe or download).
Another avenue might be to contact his family or former publicist or someone like that.