1650 diesel exhaust leak or timing off? Again

In timing window on the pump, only one timing mark can be seen.On the drive side looks like something scratched it off. Can it be timed like this?
 
The mark on the retainer plate can be hard to see sometimes if a dull etching tool was used. Pump turns 1/2 engine speed, set the flywheel at the correct mark then check the pump. If no pump mark visible turn the flywheel ONE turn and check again. May need a magnifying glass to help find the mark. That's why I use a small cutoff wheel to make the mark now, my eyes are getting dim..
 

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