Husqvarna 3120 XP
Husqvarna serials read YYYYWWNNNNN — year, week, unit. A 2001 saw is
2001 + week + unit, so 20010000000 is a safe stand-in for any
early-2001 build. Only 14 of 274 parts are serial-dependent; the rest fit
every 3120 XP.