I can't remember where I got this - it's been hanging in my shop for ages. I recently bought a brand new DRRI, and was toying with the idea of doing some speaker swaps (I know, I know, just leave the damn thing ALONE!). I think, and I'm probably way out to lunch here, that it may be a mid seventies Celestion (july 1978?). Not being sure, I turn to my ever so knowledgeable TDPRI family to steer me right. Any ideas? Did some Google snooping but can't find anything definitive.