Mainspring Lubrication

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Hi guys. Just wondering how you tell if new mainsprings are pre-lubed. I looked at the one I have but it's hard to tell. I don't want to throw oil on it if it's already lubricated. The package does say, what appears to be French maybe, that it's self lubricating. I know @Archer said in his oiling tips that some new mainsprings have a dry lubricant.

 
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"Lubed or unlubed" has been a question for the ages!

Remember, lube can easily be added but can be difficult to remove.