New (though decades old) beautiful piece of sculpture. The fit, as expected, is perfect. Line up the 53 chainring's stud with the inside of the right crank arm, insert the 5 fastener sets. jiggle the back, slotted halves ( 'nuts') to let them settle into the machined depressions of the small chain ring, tighten the 4mm bolts.
Dura-Ace equipment is always great, this is a large chain ring that I have always wanted. Have not even put it one my cranks yet, but expect it to work as all Dura-Ace equipment does which is perfect for me.
Chuck