Have you read any of the ten reviews (which you can find here: link)
I just browsed through one of the reviews by Kira and this is a quote from her review about the seam:
The texture of Honi is smooth but has "PicoBong" written on it. The words are indented in. I cannot feel them if I insert the toy, but those that are sensitive to things like seams may be able to. Speaking of which, there is a slight indented seam on Honi. It's not a seam that comes outward, but rather inward. It doesn't come in a lot and I had to look really hard to find it.