Slightly off-center Half, what's going on with the edge?

About half of the circumference of the edge of this Half Dollar is not reeded, the rest has a partially reeded edge, ranging from barely visible on one side of the edge to about half the width of the edge. Also slightly larger diameter than normal.
I'm assuming that the planchet was not entirely in the collar but trying to visualize how this happens. Uncentered Broadstrike/ Partial Collar Error?

 

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Correct.

 

Nice find!

 

I like it!

 

Remember, the collar is not a single piece. When things go wonky (that's a technical term BTW), each piece can apparently be in position, partly in position or fully in position. Making for a collection of strange and wonderfully appearing errors.

 

Wonky? I thought it was Willy Wonky.

Chris

 

We call them "Railroad Rims." A little research indicates they're not uncommon with Kennedys, although with a mintage of less than 2 million and NIFC one would *think* the Mint could have done better with this issue.

 

This is incorrect unless you are discussing a coin deliberately made with a segmented collar such as the Saint-Gaudens Eagle and double eagle or the proof President and NA dollars. (On these coins you will se a vertical bar on the edge between the segments of the collar) Your regular reeded or plain edge collars are a single piece. They are mounted on springs and can move up and down somewhat. It is also possible for them to get jammed in either the down position (broadstrike), partially down (partial collar), or jammed down on one side (tilted partial collar)

Segmented collar for the proof dollar


Closeup of a multisegmented collar from the Soho mint



Reeded edge collar


One cent collar from a dual die press.

 

sweet