Pls Help Decipher Enumerator's Notes on Census Form (General)

by Jefff , West London, Middlesex, Sunday, May 20, 2012, 15:54 (4573 days ago)

While searching the 1911 England & Wales Census last weekend I was particularly keen to look up an ancestor living in Longhope who's birthplace has long baffled me, as the previous Census's etc have given his Birthplace as "NK...Not Known". I've searched many different avenues for his birth, indeed I've identified a possible family in the Stroud area, but no hard evidence at all.
So imagine my delight when I find he was actually born in Oxfordshire, not unlikely and so a new lead to follow.
HOWEVER when I actually see the Census Form this now appears doubtful, but I'd be interested to know what you wiser people think, please ?.

When completing the form my ancestor has neatly & carefully used a pleasant clear Victorian hand in black ink, he has clearly left the "Place of birth" box empty.
However within this box(albeit it only just, and towards the far right end) someone has written "OX" in red ink. Immediately below this, and right next to the word Gloucester relating to my ancestor's wife, is written "137" or "13r" in the same ink & hand. To me this looks like a completely different hand & scribe altogether.

I presume this is the mark of an enumerator or somesuch official, and probably has NO relevance at all to the birthplace of my ancestor. If it did mean "Oxfordshire" as the website transcriber believes, wouldn't they have writen "Ox" ? Or do these characters perhaps indeed relate to a Birth Record or page of a Register ?

I hope someone with more Census Form experience and wisdom than me can please share their thoughts on this matter, thankyou, Jeff.