Not sure on the exact date but these were produced between 1973-1977. This is a great sounding head and its LOUD for a vintage SS head! Its 170 watts but I swear, and most people would agree, the Acoustic watts are louder than your average watt lol. Anyway, I bought it used from an amp repair shop and it works perfectly, I just dont use it much and its sitting around so off it goes. For whatever reason it has "bringing it home" stenciled on the one side, other than that its very good condition for being 40 years old. Surprisingly I wasnt able to find a whole lot of information on these heads except for this one webpage. http://musicstudio.bigredroo.com.au/Guitar_Amps_Acoustic_450_Lead_Bass.html Price is $200 OBO shipped to the Continental US. Ill consider just about anything as far as trades go, so throw em at me!