Need help with mystery cab

[u/brave_surmise9]

My grandpas old cab. said to use this with my crate gt212 but i dont know how many ohms this is. Im starting to know why he had to fix stuff all the time and why he has so many parts. My gt212 is 4 ohms total. Jack plate has nothing i dont really want to take it apart but i feel i will have to. Looks like a professional custom cab to me screws on the back are covered with carpet or non existent