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Because the DON and the dot next to 90 both have a dot over 100. 馃槜

Well...I learned that shipping can take its toll on a newly serviced watch...even if it's extremely well packed.
I received my beloved Seiko 6309-7049 automatic (my first 'flying watch', purchased new in 1987 while in Navy primary flight training) via the USPS. I was so excited...it had been gone for months. I set the correct time, strapped it on my wrist and went on my merry way. But then I checked the time about 2 hours later...and it was about 30 minutes (MINUTES not SECONDS) fast. WTFO?!? Maybe I set the incorrect time? OK, I reset it to the correct time. But then I checked the time 15 minutes later...and it was already about 5 minutes (MINUTES not SECONDS) fast. Double WTFO?!?!? Now I'm freaking out! I call the highly respected watchmaker (a Seiko specialist) who performed the service and he explains that most likely what happened is that it received a jolt in shipping that splashed oil on the hairspring...effectively shortening the hairspring causing it to run very fast. He explained to me in detail how this happened and it all made sense...even to this uneducated watch dude...so I'm very grateful regarding his explanation. He had me send it back to him and he received it today...and he confirmed that oil had splashed on the hairspring...so he will get it in order and then send it back to me shortly.
Anyway, that's what I learned today.

Did he tell you where the oil came from that was splashed on the balance spring? He must be using an extra large sized oiler only available to Seiko specialists...
Magnetism, or the balance spring getting hooked on the stud (common issue on some Seiko models due to their geometry) sounds much more likely to me, but hey I'm no Seiko specialist. 馃槈
...The performance described by the OP implies shoddy watch repair to me!
Please learn me something!
Can you give me the exact percentage of metals in the alloy and all the connecting parts and I will learn you some more. But to start you off alloy can be magnatized
http://www.goudsmit-magnetics.nl/EN/About-magnetism