From the look, the big analog meters and wood side panels, I'd guess it was from the 70's or maybe the mid 80's at the latest ... but actually it's 1992.

Analog Meters look great but are not very exacting. If you know the amps continuous power and headroom they can give you an idea where you are.

More useful IMO, but zero "Wow", would be two LEDs: 1 which lit if you clipped and another which held that for a second so you could see if your clipping transients