1965 Washington Quarter with OBV Bumps/Bubbles

Adesm079

In my opinion this quarter is such a cool and unique quarter, but I wish I new more about it. Hopefully someone will be able to help.

There are two parallel lines of bumps on the OBV and no indents on the REV. Are they PMD? If so, what could have caused this to happen? If they aren't, how could it have happened at the mint?

dcarr

If I saw that on a human I'd say it was bubonic plague.

Each bump has a sunken ring around it - odd.
I think they may be trapped gas bubbles that expanded, pushing the metal out.
Try pushing down on one of the bumps with your fingernail to see if it will collapse.

ricko

@Adesm079....Welcome aboard....Interesting phenomena....I would agree with @dcarr 's opinion....Let us know what you find. Cheers, RickO

PerryHall

That is a common result of high heat being applied to a clad coin. In other words, PMD (Post Mintage Damage).

Adesm079

@dcarr Lol, I've said that as well 😂
@ricko Will do and thank you!
@PerryHall I was thinking the same thing, but what heating source could have been used to do so and not cause damage to the reverse?

BuffaloIronTail

@dcarr said:
If I saw that on a human I'd say it was bubonic plague.

Each bump has a sunken ring around it - odd.
I think they may be trapped gas bubbles that expanded, pushing the metal out.
Try pushing down on one of the bumps with your fingernail to see if it will collapse.

Chicken Pox coin, Dan. First year of cladding on coins=procedural adjustment to process.

Pete (My Colonal Jessup moment)

mustangmanbob

I would consider damage that an oxy-acetylene torch would do. Pin point heat, circular, pops the metal bond and outgasses, , makes a hill.

Hemispherical

Welcome to the forum @Adesm079.

High heat treatment post mint.

Areas that were exposed to the heat were “cleaned” to remove soot.

IMO

Also, there appears to be something going on with the rim/edge.

Adesm079

Thank you guys 😎