A way to clean this button so I can read the makers mark

[Double L Relics]

Anything that cleans flat buttons without hurting them? I've already tried a toothbrush with soap and water. Any suggestions will help!!

 

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[CRUSADER]

Probably says UP[ER] [F]INE which is a quality backmark, not a makers, circa 1830s.

 

[Valley Ranger]

Boil it in peroxide and let it sit overnight. Then try brushing again.

 

[Double L Relics]

Would vinegar help?