I'm amazed at the innocence of the guy who write that article in the 50s, who probably didn't know the concept of sextoy, saw this and went: "ooooo they must have loved cucumbers :o"
Well apparently it's made of faience.
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"Faience is a glazed non-clay ceramic material. It is composed mainly of crushed quartz or sand, with small amounts of lime and either natron or plant ash. This body is coated with a soda-lime-silica glaze that is generally a bright blue-green colour due the presence of copper (Nicholson 1998: 50)."
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That said, one article I read mentioned that ancient peoples' sometimes made dildos using in part some sort of animal dung (could be cow but idr)
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But that said:
https://www.google.com/amp/s/www.dailymail.co.uk/sciencetech/article-2908415/amp/The-sex-toys-dating-28-000-years-Ancient-phalluses-stone-dried-camel-dung-started-trend-sex-aids.html
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"Faience is a glazed non-clay ceramic material. It is composed mainly of crushed quartz or sand, with small amounts of lime and either natron or plant ash. This body is coated with a soda-lime-silica glaze that is generally a bright blue-green colour due the presence of copper (Nicholson 1998: 50)."
`
That said, one article I read mentioned that ancient peoples' sometimes made dildos using in part some sort of animal dung (could be cow but idr)