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We have been trying to make sense of the Patons and Baldwins numbering system (so far without a great deal of success). Patons and Baldwins were two separate long-established spinners when they merged in 1920, and the company still exists (as Patons) in the Coats group. There are a lot of pattern leaflets and booklets to sort that were issued by Patons & Baldwins from the 1920s onwards, and I have been working on some from the later 1940s and 1950s - 9 boxes of them.
Because they haven't been properly sorted before, there are many that are duplicated, and I think that the ones that we have multiple copies of are likely to be those that P&B sold a lot of. It's interesting to see which they are - we have catalogues of leaflets from various dates, but they don't give any idea of which were successful. So what kind of patterns turn up over and over again in the boxes of unsorted leaflets? The answer is, overwhelmingly, patterns for baby clothes.
One booklet in particular, The Quickerknit Baby Book, I found over and over again and it had clearly been reprinted several times, because there were copies with several different prices. In fact, it must have been Patons & Baldwins best-selling booklet ever. It was first published in 1956, and according to Michael Harvey in his book Patons: A Story of Handknitting, it was still selling strongly in 1985 and had by then sold 3 million copies - an astonishing number.
Why was this booklet so popular, over such a long period? By chance, I found in the collections a copy of the P&B list of new booklets for February 1956, when SC44 first appeared, and it says that it "is the first publication to feature Patons Quickerknit Baby Wool, Patonised". Quickerknit Baby Wool is described as "thicker than 4-ply and finer than double knitting" - evidently double knitting was not thought suitable for babies, but this would knit up more quickly than 4-ply. "Patonised" wool was treated to be shrink-resistant.
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So I don't know why SC44 continued to be such a huge best-seller. The baby isn't even especially cute.