Recent Finds - Button ID help

[Jaichim24]

Here are some recent finds of mine. I'm curious as to what if anything the HD stands for on the button. I know that the American Button Company out out of Newark NJ was in business from 1901 - 1920. What does the HD stand for?

 

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[vpnavy]

Nice finds and haven't a clue what the MD stands for Jaichim24!

 

[CRUSADER]

I'm going to guess the 'D' is Department

 

[blugotti1]

health dept.?

 

[Iron Patch]

It stands for "hot damn" there's a CT copper just over head.