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drbuster · 04-09-2009, 05:48 PM

Alanint, these marks are usually hardness test marks done at the factory during test firing to make certain the metal meets the minimum hardness standards.

04-09-2009, 05:48 PM	#4
drbuster User Join Date: Jun 2002 Location: San Mateo, California Posts: 1,432 Thanks: 2 Thanked 71 Times in 56 Posts	Alanint, these marks are usually hardness test marks done at the factory during test firing to make certain the metal meets the minimum hardness standards.