I think that you may have been right on your first guess. It looks like about 1/2 OZ to me too.

It can be hard to tell depending on how compressed, damp and/or seedy it might be.

However, it def is not an OZ. As a reference, below is a pic of 30 grams of "The Chronic".
FLORIDA MON Reviewed by FLORIDA MON on . Is this an ounce? Please I need some info Well "supposedly" I bought an ounce and to my eyes its looks like a half ounce and I have a scale but its inaccurate so I couldent tell what exactly the weight was but from the scale I was guessing about 15 grams in total.... so just wonering if you guys think my scale is correct? Rating: 5