Charlie,
Here are two suggestions that might give you some insight. First, if you are talking about the tip of the forend, there is an album "
Examples of Parker Forend Tip " (click this link) that has examples of tips to look at. If you let the mouse "sit" on top of a picture that is a close match the grade of your gun in question, it should show the grade of the gun in the album the tip was on. To get a better look at a picture, simply click on it and it will enlarge.
Also, in the "
Parker Grades" link off our parkerguns.org page, you can look at the high grades there. I know there are forend latches pictured. Again, click on a picture to see it enlarged.
If you can post a picture of the one in question I'm sure you will get opinions on its grade.