Hi, I found someone on the internet who is selling me an old model of Big Muff, he says the muff has the 3003 circuit and the date of manufacturing is week 41 from 1978.

As you guys have a lot more experience than me on ehx fx, I´d appreciate if you could take a look at the pics, and please tell me if the info above is acurate and what´s your opinion of this particular model sound.

It´s kind of urgent because I have to decide tomorrow if I buy it or not, so Thanks very much in advance for your help.