1921 Morgan Arrow Head Scribbles

Those are polishing lines from the mint trying to clean up the die. Must have been something in the arrow point that they wanted to remove and the cure was worst then the bite. I've run into this on some of the clashed Morgans before and sometimes its even used as an identifier. With the new scope you'll start finding more of this. Guess they had "Take your child to work days" back then too!

That's a standard feature of the D1 (17 berries) 1921 reverse. I don't know if it's from the master hub, but I've seen that on every D1 reverse I've ever held.

It seems that the Philadelphia Mint, which was responsible for producing all the dies and collars used by all mints, established reed counts arbitrarily by mint. Over the years, 21 different reed counts between 157 and 194 reeds can be found on Morgan dollars. The Mint produced its own swedging tools to force the reeding into the collar. Just like dies, it took more than a few collars to produce all the Morgans struck, so multiple collars were used in each year. It's believed that the process used to produce the swedging tools allowed for a 1-reed difference between examples in a given batch; that can account for some of the differences in reed counts.