I wouldn't be too hasty there. There are a lot of counterfeits of that era, There is a whole section in the back of the Scott Specialized covering them. It's right before "Test Stamps" in my 2016 Catalog. I have a counterfeit of what I believe is 4489, but only 4491 is listed as counterfeited in my 2016 Catalog. A newer catalog may contain the OP stamp.
I would hang on to that!
Lars
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