Info on a Case knife please

[crazyengineer]

I dont know if this is the right place to put this, but i am looking for some information on this knife

it is a Case
on the blade it is stamped Case XX and 5161 SAB

there are pictures here

http://www.flickr.com/photos/61421251@N05/6044242374/in/photostream/

(they are in the album)

I am really interested in age/date of manufacture and basically anything else that can be given

 

[supratentorial]

Nicely figured stag handle on the pile side!

The Case XX tang stamp is circa 1940-1964
http://www.wrcase.com/case_college/tang_stamps/

 

[338375]

I'll bet that old hunter has a lot of memories, and still has a lot of years left in it

 

[ptradeco]

Are you sure about that number? The 5, the 1 and the SAB all seem okay but that 61 does not really fit that knife. I am no Case expert by any means but it does not seem right.