This is one of my favorite "small" Niebling patterns. The finished doily that I purchased on eBay (several years ago) was probably made using crochet thread Size 20; and knitting needles U.S. Size 0 or 00. The square versions were published as "Kleeblatt", and are available in my e-junkie store.
(Also published in Lavori Artistici A Calza Nr. 5, as Figure 12 by Edizioni Mani Di Fata, Milano, Italy)
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