Sten Bayonet - real or repro?

I grabbed this Sten bayonet a few years ago ( $50 ) and I've tried reading as much as I could find, and viewed as many pictures as there were. But there doesn't seem to be any definitive place to find out exactly what does a real bayonet look like. I've seen a few repros, and they appear fairly obvious that they were in fact reproductions. And to be fair, most of the guys were selling them as such. But I still can't find anything, especially on the web, that shows what a real Sten bayonet should look like.

I understand they are a rare item, and have heard a bit of the tale of them being destroyed long ago, but I can't find a pic of any that have been determined to be real.

I can't tell from the welds, stampings, etc what a real one should look like.

Obviously any further information is appreciated fellas!:) I practice my SMG charges in my basement.

This one is stamped along the retention spring - B&J S.L.
Along the body - B&J ******

http://www3.telus.net/hansonk/sten bayo 1.jpg
http://www3.telus.net/hansonk/sten bayo 2.jpg
http://www3.telus.net/hansonk/sten bayo 3.jpg
http://www3.telus.net/hansonk/sten bayo 4.jpg