Welcome home little one, I've been expecting you...
Side by side with Rs2
Ear pads have slits like the Flat pads
Side by side with the Rs1i
I bought them from the original owner which bought them back in 2004. No serial number, square posts, circular notch on the metal part where the cable rests. Heck even the ear pads were original!...which of course were already flaking apart and stuck to the wood. I spent the next 30-60 minutes meticulously taking them off(covered the drivers and the back of the headphones with painters tape while doing this) and then treating the leather headband and then the wood with the wax mentioned above. These pictures were taking before I did all of this...woops!
Wow! great phones!