I don't currently own a Rensho but it is one of my must have at some time bikes. My question to you guys is this, what is this downtube decal between the renso stripes? See picture below. I have only seen it a couple times. I know it means "San Ren Sho" and was supposedly done by his mother. Was there any meaning or purpose to it? Why is it only on a few frames and not more?