this is north of scotland dating - Dating fender silverface showman reverb
Fender switched back to the blackface era cosmetics some time in 1980.
Twin Reverbs produced between late 19 have a black control panel and silver sparkle grille cloth.
The Vibrolux is quite similar to the Pro Reverb 2×12″ except for the smaller speakers, output transformer and power transformer. 10″s provide a more scooped, responsive, punchy and sparkling sound than 12 inch speakers.
The 12″s are fuller, warmer, looser in the low end while having more mids and a more three-dimensional tonal spread.
The power transformer and power tube circuitry is equal to the Super Reverb, but a smaller output transformer lowers the clean headroom and introduces sag and breakup.