Pete, I meant to mention in the post if you look at the raised middle band on the bullet on the left you will see a slightly raised band just below it. This is a tell tell sign it is a Linen Sharps and that is what I have always referred to the MM-185 as being. The MM-185 is also a bullet that normally has very faint grooves.
Ian thanks for posting pics of the two bullets. It will make it easier for everyone to see the sight band I am refering to.