What year front end / brake set up is this?

Norton7d

XS650 Junkie
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Just bought a 71 with a dis brake, it was my opinion disc didn't occur until 72?
It has a 73 inspection sticker, so I assume its either. 72 or 73 front end?
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Master cylinder looks like possibly a ‘75???? Not sure what other years it was used on. Where is the brake light switch on it?
 
On the early disc systems the brake light switch is a pressure switch down on the manifold on the lower triple. It’s not on the lever as on later bikes.
 
Definitely a 72. Big nut and square washer are on the shaft that the rotor rides on. Rotor looks to be a 72. Master cylinder may be aftermarket should not have threaded hole for mirror. The break light switch was on the bottom side of the master cylinder on a OEM MC.
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