I was going to ask to see the "backside" of the timer but after looking a bit I realized you posted pics of everything you need to see.
That looks like a really cool design - letting you pull the timer and clean/oil/grease it without removing the spark advance rod.
It looks like other than the brush arm being cracked it's had very little or even no use - I can't see any wear on the contact surface.
It does look good!
Seth, The unit is NOS. I fumble fingered the rotor and it broke when it hit the floor.
Oh no! That sucks. It's a good looking timer design. If I was still running coils and a timer I would want to try it.
Send the broken rotor to Bob Scherzer and he will cast a new for you. Bob does beautiful work at reasonable prices.
Ron the Coilman