Space Age AV32+2DCD That is an electromechanical horn on the rear of the strobe plate. Brand Space Age Electronics
STI SS-2000F Category : OtherCan’t remember where exactly I put the key for this unit. It can still open with an allen wrench, but...
Gaylord NC-1357A Category : GaylordI like this unit so much in part because there’s no branding on the front.