Found by Navy diver

[Fragman]

Hi, This photo has been around for a while, but to date no one has been able to identify it. It has some distinctive features, so I’m picking someone on BOCN will know what it is. Cheers

Update: Thanks for the link

 

[Alpini]

four posts below, only a few days ago:

http://www.bocn.co.uk/vbforum/threads/89359-ID-if-possible-please