STEPHEN Wainwright, who compiles the Sutton Beauty and Heritage website, tells me: “To me the joy of having a heritage website is not knowing who will get in touch next.

On October 4 I received my first email from Mexico after Eliseo Amavizca unearthed a relic from the industrial past of St Helens. The metal detector enthusiast found a plate measuring seven inches by five inches with the writing ‘United Alkali Co Ltd, Walker Works, 70% 72%, Caustic Soda, St Helens, Great Britain’.

“Although Eliseo got in touch via Sutton Beauty & Heritage, the Walker Works was actually in Merton Bank. Barker and Harris’s ‘Industrial Town’ describes it as being owned by Thomas Walker from 1876 until 1890, when it was swallowed up by the giant United Alkali Company. It was a small chemical works which was apparently closed in 1892. I expect that it was taken over just to eliminate the competition. So Eliseo’s discovery can be dated as between 1890 and 1892.

“I asked Eliseo to have some photographs taken and asked him a few questions about his find.

This was then packaged up for the St Helens Star and an article was published. Eliseo was delighted when I sent him the page from the Star’s electronic edition.

“He wrote: ‘It is excellent. I can print it and translate for my detectorist friends to learn that valuable things are not always made of precious metals.’ I quite agree!

“How the plate ended up under Mexican soil will no doubt never be known. However that isn’t the only mystery.

The day after publication I received an email from the Catalyst Science Discovery Centre in Widnes, who it turns out have been tracking these oval-shaped iron relics for some years. They sent me a photo of one from Golding Davis of Widnes, which had also been part of the United Alkali Company.

They acquired it via eBay and have seen two others being auctioned in the past, all located within the USA.

“In the Star article I speculated that Eliseo’s find may have been the iron lid of a caustic soda container that had been shipped to the Americas. However the Discovery Centre say they haven’t been able to figure out the exact function of these old relics. One was advertised on eBay as a “trivet”, an iron device for holding cooking pots over flames or a grate, as it has a circular ring on its back.

“I would be very interested to hear if anyone has any ideas about the purpose of these ‘plates’.

The common characteristics are that they’ve all been discovered abroad (in the US and Mexico) and all seem to have been connected to works within the United Alkali Company.”