B744V and B744VL transducers made before 2009 had a clevis pin through the top of the speed insert.
Models made after 2009 have a second top cap that holds in the speed insert. These later models are sometimes referred to as the B744VC and B744VLC.
The best way to identify a transducer is by the white plastic ID label attached to the cable.
Click on one of the images below to go to a detail page showing dimensions and parts for that model.