Brass plated steel cuckoo clock chain, wound to a fine 74 links per foot (LPF) at 0.70mm wire gauge.
At 74 LPF and 0.70mm wire this chain runs noticeably finer than the two most common Regula chains — 61 LPF/0.90mm for the Regula 25 one-day movement and 48 LPF/1.20mm for the Regula 34 eight-day movement — so it suits lighter-duty or smaller cuckoo movements rather than those two mainstream calibres.
Count the teeth on your movement's chain wheel (the toothed wheel the chain runs over inside the movement) and match it against the links-per-foot and wire diameter given here, since it's pitch and gauge that determine fit, not the movement's brand name.
The details
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Pitch — 74 links per foot
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Wire diameter — 0.70mm
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Link size — 5.50mm x 2.90mm (length x width)
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Length supplied — 180cm
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Material — brass plated steel