Addendum 1
In January 1990 the Colin Harper collection of shells in pottery and porcelain, also glass, books, watercolours & prints was auctioned via Phillips in London. Ad Hovestadt kindly lend me the catalogue of this auction, in which I found one item with land shells [1: item 68].
Both snails are clearly Helix-like species, but their color pattern is a personal interpretation of the anonymous artist…
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