Welcome, as an aside, if I was replacing the movement in a SKX007 I'd swap a new NH36 in instead of an old 7s26. Apart from the advantage of the reliability of a brand new movement you get the bonus of hand winding, on top of the auto and hacking. What's not to love for about $30?
I'm a novice in watch repair excited to have resources like this forum available to me! The idea of watch repair all started when I dropped my Seiko SKX009 and realized it was no longer keeping acceptable time. I have tinkered with machines all my life and just received my BS in mechanical engineering, so naturally I wanted to know how everything in my watch worked. I started researching about watches and eventually came to the conclusion that the balance staff pivots are likely broken, but in either cases I could see the balance wheel wobbling.
Fast forward to now, I ordered a Seiko 7s26A movement from eBay and want to replace the broken 7s26B with the 7s26A, and the 7s26B can become a practice movement for me. My issue now is that the movement from ebay looks mostly legit, but has a sign that it may be fake or using some non genuine parts. Anyone have experience with the legitimacy of eBay stand alone movements?
The issue is with the lower plate. It seems that all pictures online show the words "SEIKO" on the lower plate next to and below the balance wheel. My movement does not have the words SEIKO on the lower plate at all. It is also a twenty year old movement which raises concerns on the oil and grease, the eBay seller said that they sonically cleaned it and oiled it though.