stamp option

A quick learner says:
Hi
Can you take a look at the photo & tell me if that stamp option 2990 applys to product code: S351-30

Thanks
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I'm afraid 2990 is not a stamp used anymore. Manufacturers changed how they assigned stamps. I recommend placing your stamp on a scale and weighing it, then referring to the chart we show on the S351-30 store page. That will tell you what you need.
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