Thank you for the responses John and Uwe, I don't have any extra photos of the raised ridge, but it I believe it is as you said, there used to be ears attached to it. The color of the lacing is indeed quite bright, I initially tought that might have been some changes in brightness or contrast from the phone's camera, but then the last 2 pictures are much much darker, so it could be anything haha (altough it's most likely closer to the bright version of the picture)
I know much less about the lacing so I didn't pay attention to that much, now that I look at it some parts do seem rather...messy in comparison to many other examples.
Regarding the "Sendai features" is there a specific style of menpo in that area and by what name would that go? I only know about the Sendai Dou.
Thank you!
Jonas