The easiest way to tell is by looking at the round brace rod which attaches to the middle back side of the moldboard.

HS = grooved end with corresponding washer - also is slotted for adjustment

NU= flat end with hole and bolt through it only...no grooves

Parts are available for both kinds (I have them among other plow parts).

As Carlyle stated, it's most likely HS bottoms,but I've owned several with NU bottoms (made after 1968).
See the link below for more information and pictures.

Tyler in IL
Plow bottom ID
 
They are hs bottoms got the info from your site then I went to JD parts and there is about 20 different numbers for hs bottoms even after you narrow it down to one size bottom
 

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