Based on what I find online, it appears that E860 has a different numeral display for its 6, 9 and 12. Additionally, the back of the case also does not indicate 14k gold. These are some pics I got. Hence, I think the only way to be sure is to open the watch and send the movement and case numbers to JLC to get an Extract of Archives. Didn't expect this to be such an eventful journey ;-)