The variation my father (born 1915, service in WWII) used during my childhood in the 70's was thus:
Oh yes, I see it all, she cried, as she waved her wooden leg"

He used this as a humorous expression of wry surprise whenever he'd figured out some particularly annoying problem or uncovered a clue to a mystery.

It would seem that things are becoming circular as this URL - http://english.stackexchange.com/questions/84554/origin-of-i-see-said-the-blind-man-as-he-waved-his-wooden-leg - deals with the origins of the first part of my dad's version, and there is a comment on that thread - http://english.stackexchange.com/posts/84562/revisions - which refers back to a comment by McGrath of Harlow in 2006 on this one.

So, a Wellerism of some old song, bent and twisted through the age across the English speaking world in the early part of last century. Perhaps a mystery we can only approach but not solve. Good enough for me.