Differential Feed
the ruler features precision measurements and easy-to-read black and white markings arranged in 1in grids with 1/8in and 1/4in increments
980 Prisma
If you are looking for something else
this pattern is modeled after the Transverse Mountain range in California
Cam Gear w/ Worm Wheel, Viking #4115984-01 LVWarehouse Differential FeedGuaranteed to fit Husqvarna Viking Sewing Machine Models: 2000, 3020, 3610, 4100, 4300, 4500, 4700, 5530, 5610, 5710, 6020, 6030, 6130, 6140, 6170, 6230, 6240, 6260, 6270, 6360, 6370, 6430, 6440, 6450, 6460, 6470, 6500, 6570, 6600, 6640, 6670, 6680, 6690 (All Models 2000 6690) Alternative Part Numbers: 4111926 01