LM301 - Single Op Amp - Metal Can TO-99
This IC is practically identical to the more well-known LM308. I've tired both in a Rat and cannot hear a difference.
But most importantly, these bad boys are in the super-cool TO-99 case...otherwise known as Metal Can Mojo. These are made by Motorola.
I was only able to get a small handful of these at a low-enough price to resell, so if you need one, go ahead and get it now. :)