Q for Ambassadeur Collector Gurus

[nelz]

I have a question that likely only the most knowledgeable Ambassadeur collectors might be able to answer:

As you know, the awesome little red Ambassadeurs switched from four screw frames to three. This happened around 1967-68. So, what is the very last year that you have seen a four screw Model 6000?

According to my research the last 4 screw 6000 was released in 1967 (indicated by serial #100702) which dates this reel to October (10) 1967 (07) and (02) indicating it had a clicker.

Have you ever seen a later 6000 than this?