In some cases you can actually go up a size and get away with it, most straps with some give will let you run a 20 on a 19 or a 22 on a 21, some of the DeVilles and Aqua Terras had uneven lug widths like that. The Omega vintage Mesh bracelet can also fit down 1mm in size, as the rings on the ends can be bent inwards slightly to give a snug fit on a 19mm with a 20mm bracelet.
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