Konstantin Chaykin’s Master of Days cufflinks advance a weekday display when you fasten them. They do not keep time: fastening actuates the day indicator, making this a mechanical novelty with a specific, practical function rather than a miniature watch.
What are the cufflinks that tell you the day?
They are the Master of Days by watchmaker Konstantin Chaykin. The maker describes them as “Mechanical cufflinks that advance the day-of-week display when fastened.” The mechanism is the defining feature: securing a cufflink moves its display forward by a day. Konstantin Chaykin’s product page
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How does the day display work?
In Hodinkee’s October 9, 2026 report, fastening the cufflink—by flipping its securing lever—advances the weekday display. The report says both cufflinks show the same weekday information. They indicate the day; they do not function as clocks. There is no crown or regulating organ because the cufflinks are not designed to keep time. Hodinkee’s product report
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What are they made of?
Hodinkee reports that each cufflink uses an A.01-1 calibre comprising 40 components, housed in a titanium case measuring 18 mm across and 5.7 mm thick. These specifications are reported by the publication; the manufacturer’s product page reviewed here does not independently confirm them.
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What do they cost, and are they available?
Hodinkee listed the price as CHF 4,500 and availability as “Now” in its October 9, 2026 article. Those are the details reported at that time, not a current price quote or confirmation of stock. The manufacturer’s site features Master of Days and links to buying information, but current checkout terms and inventory are not established by the sources cited here.
How are they different from a watch?
A day-date wristwatch displays the weekday as part of a timepiece that keeps time. Master of Days instead advances its weekday display when fastened and does not tell the time. Ordinary decorative cufflinks have no established day-advancing function. The available information supports this functional distinction, not a broader performance or value comparison.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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