Unregistered

Can someone please help me in identifying this artwork? Op/Acc/42 Number 35?
Can someone please help me in identifying this artwork? On the back it says Op/Acc/42 Number 35? Any ideas on what this means? It is also cut circular? I just like it because it is so unique. I don't know where I found it at or really any background about it at all. It was in a crazy frame for the longest time (screws from the inside) someone told me the frame was very old and they stopped framing art that way a very long time ago. I have attached some links to pictures I took and uploaded to tiny pic.

http://i55.tinypic.com/wcoe3p.jpg
http://i56.tinypic.com/2wqvkgm.jpg
http://i53.tinypic.com/2uz2fmh.jpg