Dating Sylko Cotton Reels

We hope that this reference will help if you have vintage Sylko cotton reels that you are keen to date. Confirming an exact date for any specific cotton reel is difficult if not impossible, however the labels did change over time and by comparing these to contemporary adverts etc. it has been possible to identify time periods where different reels were on sale. We don’t claim that this is 100% accurate and it is very much a work in progress, if you can help us with different label designs or further information then please get in touch.

If you are interested in the different colour threads and their numbers then please check our list of thread colours and of course we have some for sale, check here.

Note most threads appear to have came in both No 40 and No 50 weights. Number 40 was described as for “general requirements” and is the most common. Number 50 was described as a “…finer thread suitable for stitching the most dainty and delicate fabrics…” The red and the blue print were reversed on the No 50 on most labels.

In the following we will refer to the label with the three shells design as the front/top and the label with the colour name and number as the rear.

This front label dates back to at least 1909 though may have been used earlier and was used well in to the 1930’s.

Note the thread weight appears on the rear label and not on the front as it did on subsequent designs.  On these labels the No40 was printed in gold and the No50 in blue.


This front design was in use by 1938 (the previous style was still being used in adverts in 1937) and was used until the mid to late 1950’s. This still includes the words “Silk Substitute” and a thread weight is now given. This style of label was also issued on larger reels with a No36 weight and at least one marked 24/36.

We have placed the rear labels in the order they were probably used (though there was in all likelihood some crossover). The first type (D.137) doesn’t give a colour name whereas D.136 does. D.117 introduces the Sylko brand logo on the reverse label. D.235 is an early example of the LD acronym being dropped and D.125 was probably the last style that was used with this front label design as it went on to be used with the next type as well (see below).

We have found both the D.136 and the D.117 style labels on small size (2.4cm high) reels, these were, we believe, produced in the war years as a result of rationing.


This front design was introduced between 1954 and 1958 and was probably used until the early 70’s. This featured on both wooden and plastic bobbins (the latter certainly by 1971 and possibly a little earlier). Note the words “Silk Substitute” have been dropped. This style of label was also issued on larger reels with a 36 weight.

For the rear label there were a couple of different labels used on standard size wooden reels, note the second one illustrated (D.305) includes British Standard B.S. 3418-61 which was for Domestic sewing threads (cotton and linen) and was introduced on the 25/9/61. The D.123 illustration seems to be the earliest rear label used on plastic reels though D.460 shows that it was occasionally used for wooden ones too.



This front label was used on plastic bobbins only. It was in use by 1973. Note the use of grey ink instead of blue on the top images (the No50 weight came in the blue as well as grey).

There were two distinct types of bottom label used, the one with the broader band came first and was similar, but not the same, as the style shown on the previous type. This was later changed to the thin band example (D314/D274), both types dropped the point after the D in the thread number. Note that on illustrations for D314 and D274 the order of the metric and imperial measurements has changed, this probably occurred in the second half of the 1970’s.

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