Yes it’s that time old question. Do I have an original or not. 
Discogs states:-

Original stock and Promo copies also have a raised 3-digit 'hallmark' under both A & B labels. On some Promo copies they are situated:
A - below the G in SANDBAG
B - bridging the A and N in SANDBAG.
On some copies they are aligned differently and sometimes only on one side.
The 1970's bootleg with identical copied labels has a pronounced concave centre and a 9.5mm run-out groove as opposed to 8mm on this original.

My copy has a very slight raised number under the label on the ‘Where Were You’ side - see close up on first picture and it IS under the ‘G’ in SANDBAG. I can’t find it in the YDLM side but it so feint on the other side it might be not visible  

I can’t compare the runout measurements as described above as my label is slightly off centre. 
My copy also has a slight ridge in the label but so does the picture that appears on Discogs. 
So what do I have???

It is real one.  The stamp is M.S.I. Co, Philly pressing plant

The position of the stamp is not fixed.

But its mere presence denotes an original.

That is good news. I bought it probably 35 years ago as an original and was just thumbing through the boxes and I was wondering

From your photo, in this instance, I reckon the raised lettering on the YDLM side is just below “ME”. Have a feel, using a very light touch.

Proper one.