When was the Hallmark grading service in operation?

Why did it cease operation?
It's slab, in modified form, continued in use by PCI and DGS, but those were different companies.
It's slab, in modified form, continued in use by PCI and DGS, but those were different companies.
All glory is fleeting.
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http://www.american-legacy-coins.com
I acquired around 1989....but it may have been slabbed well before then.
"Everything is on its way to somewhere. Everything." - George Malley, Phenomenon
http://www.american-legacy-coins.com