IIRC, there is the 774 and the 774LC tonearms. Different from one another.
The 774LC is like an early upgraded Jelco ST-250, the one that was at the end run of ST-250's. I believe it was pretty well identical to one of the Jelco sourced AudioQuest arms.
https://www.vinylengine.com/library/mission/774lc.shtml
I've got an unused 775 with a 774LC tucked away (literally unused since it was used in an audio review, when it was new).