Clad Half Dollar Planchet

I'm new to the forum, but have used forums for years. I worked as a Toolmaker for almost 20 years and then worked in a non ferrous wire redraw mill overseeing the reel to reel electroplating and water treatment/recycle departments for 29 years. Finally used the chemistry in my BS. Retired now.

I got out my coin collection recently after being in the closet for at least 30 years. My 9 year old grandson is taking an interest in coins, so I got mine out! Even visited my local coin store and bought a few coins, some for him and some for me. My wife even joined in and really likes the Morgan dollars.

My mother worked in a bank from the early 1960's to the mid 1970's and found numerous coins for me in circulation. Some were errors and I just tossed them in the box not thinking of them. I started taking photos of them today and this is the first.

It is a blank clad Half Dollar Planchet. This one has a large ding on the edge which allows me to ID it from the other one I have. The edge is not reeded.

I got out my micrometer and dial caliper to measure it, as well as my scale.

Weight: 11.182 grams. Finished clad half dollar weight: 11.34 grams
Diameter: 1.184" or 30.074 mm. Finished coin: 1.205" or 30.607 mm
Thickness in middle: 0.0682" or 1.732 mm. Finished coin: 0.085" or 2.159 mm.
Thickness at edge: 0.0762" or 1.935 mm.

I am wondering about the weight. Both of my planchets are less than the finished weight of the coin. Anyone know the tolerance on the weight? Is mine within that tolerance, or is there another step in the process that adds some weight?

Photos: scales are 0.010" per division or 1.0 mm per division. The ding on the edge is raised more on one side than the other so I will be able to tell which side is which. The edge view shows the ding face on.