I recognized that only one thrust washer can be seen on the timing side. But in the manual is stated that after engine number 200000 2 washer are required....
My factory manual
copy gives the following information:"On engines between numbers 200000 and 300000, a flat thrust washer is fitted between this chamfered washer and the crankcase."
As your Commando is a 1973 850 model, it should have an engine number higher than 300000? So, no second washer.
Also, check what it says in the Old Britts info:"06-2601 -- NORTON, Washer, Thrust, Camshaft, Some 1972( $5.62 each). This tabbed thrust washer is only used when fitting the 06-2600 bushing and there is a locating hole for the tab in the crank case."