Hi JAB!
While unsure, I seem to recall somebody showed me a 1933 1/2d with the overdate. 
So I took a stab on your coin with photoshop and resolved these details:

I think it's easy to see the last 3 in the date has a longer downstroke than the first 3.
I've seen this on many 1933 pennies, which I'm guessing is due to the last digit being punched into the die with a different 3--can anyone confirm here?
So I suspect that's what is happening with your coin, unless it actually looks more like this (This is the 1933/2 1d):

Here the narrower stroke for the 2 is obviously extending below the 3. Someone has described it as a "fingernail".
There will also be evidence of the underlying 2 protruding from the right side of the 3.
So I took a stab on your coin with photoshop and resolved these details:

I think it's easy to see the last 3 in the date has a longer downstroke than the first 3.
I've seen this on many 1933 pennies, which I'm guessing is due to the last digit being punched into the die with a different 3--can anyone confirm here?
So I suspect that's what is happening with your coin, unless it actually looks more like this (This is the 1933/2 1d):

Here the narrower stroke for the 2 is obviously extending below the 3. Someone has described it as a "fingernail".
There will also be evidence of the underlying 2 protruding from the right side of the 3.



















