Definitely an earlier one, haven't had the privilege of working on one of those. Other than the power switch it looks to be just like the original one with meters. I don't know when GAS changed the power switch from rotary to push-button. No Fairchild transistors either so that's a plus.
I'm right behind you at 62 years young, I refuse to grow old!
I'm right behind you at 62 years young, I refuse to grow old!