No, I haven't seen this one! Thanks for the tip! It's a very interesting site, and gives great tips on where to find surviving guns. (In just a short glance through I saw one 15cm SLK i.R. preserved in Australia, that I have never heard of.)
This French site has been visited a few times by individuals who also frequent this one. I think it is an excellent effort, and quite well done. There are some minor errors/ommisions though. Should you click on the allied option for example, you note some ordnance incorrectly named. The first page, for example illustrates a heavy piece beside a Verdun memorial. It is not Russian ordnance.
I confess I visit often; hoping to see new items posted. Someone suggested last month that the Aberdeen examples from WWI should be submitted for inclusion in this site. A pity I'm afraid,.. only two pieces from that war remain at Aberdeen,.. the rest have been disposed of on two seperate occasions.