Off topic but curious, who makes good metal detectors today? I haven't used one since I was a small kid. But I might look at one. I just don't even know who makes good ones these days.

The Tesoro Compadre[0] is pretty great and very affordable.

Best in higher end might be Nokta[1] and its sister company Makro[2].

Anything from any of those three companies will be good and high value.

[0]http://www.tesoro.com/product/detectors/compadre/index.html

[1]http://noktadetectors.com/

[2]http://makrodetector.com/

Whites is brand that has been around since the 1950's

https://www.whiteselectronics.com/product-category/metal-det...

On the WW1 front lines farmers still turn out old artillery shells fairly regularly. They still find old Wehrmacht gear in the Belorussian swamps

Swamps my arse, we still find German bombs in undesirable suburbs of London:

https://www.theguardian.com/uk-news/2017/mar/03/second-world...

Of course, it's a mutual thing:

http://www.bbc.co.uk/news/world-europe-39828327

But, as usual, it's the French who practice this at its highest level:

https://en.wikipedia.org/wiki/Zone_Rouge