Here's a short piece I wrote about identifying the various types of 4x5 grafmatic.
http://www.paulewins.com/blog/?page_id=54
Note that although 1168 is the one you want, I have seen some with that catalog number but the graflok base. As far as i can tell the base is the only difference between the two types, so perhaps when people upgraded to cameras with graflok backs they got their grafmatics upgraded too.
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