GW402, 'Green Wave', 1988, with prototype baby straps. From the period that Swatch was testing which material would be best to produce these straps as they would be worn tighter than normal straps. There is handwriting on this prototype strap that says 'Arnitel®EM400'. This is a high-performance Thermo Plastic Copolyester (TPC) from DSM. Extremely rare, just a few known. Catalogue page 50/5.
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