We would like to inform you that the "Stitchlock" machines of W664 and WT664 - series will be specified as UT5xx with Y-number. This change was announced recently by Pegasus.
Please refer to attached table of "Stitchlock" machines for further details of available main classes and subclasses.
The new subclasses will be introduced step by step.

Note:
In case of combination with HG410 or HG411, the Y-number is a different one in comparison to the model without HG-device.