Interimlamb Watch

Interimlamb Watch is the work of Kenkichi Kumada, an independent Japanese watchmaker working alone in a small workshop, producing custom, quirky, and highly mechanical timepieces built around rare hand-executed complications rather than a standing commercial collection. Kumada's watches are best known for two distinct mechanical personalities. The first is the jumping hour: rather than an hour hand sweeping continuously around the dial, the hour is displayed through a small window in which the numeral instantly jumps to the next digit the exact moment a new hour begins — a classical complication requiring precise energy storage and release to execute the instantaneous jump cleanly, executed here entirely by Kumada's own hand rather than sourced as a finished module. The second is the single-hand watch, exemplified by his 'Idler' model — a watch that tells time to the nearest five minutes using only one hand, deliberately built to encourage the wearer to slow down and read time more contemplatively rather than to the exact minute. Across both mechanical languages, Kumada's own hand is present in nearly every visible and hidden detail: he machines and heat-blues his own star wheels and custom components in-house, a traditional colouring process achieved through carefully controlled heat rather than chemical treatment, giving his movement parts the deep blue associated with the finest hand-finished watchmaking.

Because of the intensely handmade nature of the work, Interimlamb watches are produced in very small batches, and Kumada's order books have reportedly been closed for years at a time given how limited his production capacity is — pieces rarely appear on the open market, and when they do, they command significant premiums from collectors who have been unable to commission directly. The IL020, one of his documented references, pairs a Swiss automatic base movement with a custom, entirely handmade jumping-hour module of Kumada's own design and construction — Swiss mechanical reliability married to bespoke Japanese hand-complication work — in a 41mm stainless steel case (48mm lug-to-lug, 12.5mm thick, 22mm strap width) with a sapphire crystal. Every Interimlamb watch produced is a genuine one-of-one: no two examples of the same model reference are identical, each carrying its own individual variations in finishing, dial execution, or component detail — a level of true uniqueness rarely offered even within the independent watchmaking world, where 'limited edition' more often means a numbered run of visually identical pieces rather than watches that are each, in the fullest sense, singular objects.

The backstory, told in Kumada's own words on his workshop site, explains both the name and the mission. Born in 1972 into a family where both grandfather and father were watch repairers, Kumada spent years working outside horology entirely; after his father's death he took up the repair and sale of antique watches, and in 2012 installed compact machine tools in the workshop his father had occupied and began building original designs — christening the atelier Interimlamb, which he explains as meaning the living people in their own lives. His founding conviction is quietly radical: that the mechanical watch may be the last stand of wearable, electricity-free mechanism, and that while computerised manufacturing finishes work with extreme speed and precision, something worth preserving lives only in the handmade. The jumping-hour module that defines the IL020 bears this out — its instantaneous jump is produced by a linkage of three star wheels and one push wheel governed by spring levers, with Kumada admitting the hardest part was tuning the spring tension so the jump fires cleanly — and his blog documents the labour behind every detail: indices sawn from steel plate, frosted by pressing into emery, a single hand consuming a full day of cutting, hardening, and lapping before heat-bluing. Base movements have shifted with supply — hand-wound ETA 2801 chosen for thinness on early examples, Fontainemelon and automatic bases later — and Kumada has noted candidly that unstable movement supply may end certain references, adding another layer of scarcity to an order book already closed more often than open. From Yamaguchi Prefecture, far from Tokyo's watch scene, he continues a three-generation family thread: the repairers' son who became, in his own workshop, a maker.