[ImEvil1]

Low-tech pic, but you can definitely see the metal buttons.

I don't think there were many convertacoms in use. I'm sure that they were more prevalent in some areas as opposed to others, but a good portion of the footage from FHP shows the Troopers wearing lapel mics. Most of the Troopers I ever worked with had lapel mics also, and I never saw any of the units in use in my area (1991-on). Most of the officers in S. FL I saw with the convertacoms didn't use them with lapel mics, as they were constantly off and on of their duty belts as they got in and out of their cars. I can't see them leaving the lapel mics attached and putting the radio across their body (or behind them) to charge.

I'll put a few calls in and see what new info I can come up with.