I found this dial and would love to know what it is.
It looks unfinished as there is no lume on it, it is steped but not as pronounced as the original dials
it also is marked Singer on the back. The dial feet are to narrow for the 321 but it does not have Professional
written on it. Also the Swiss or t swiss t is missing at 6 o clock

Here are some pictures

 

I'd say a not bad done reprint. The Swiss made is missing completely and both feeds welded poorly, yes very strange indeed. I can not imagine that a Swiss product is missing the Swiss made sign