Its not a breeder or seedbank, clone only strains are only available as clones. Mostly they are special selected phenotypes of a commercial strain, or old classics who was keeped by someone somewhere...

Chemdawg a

This is the "a"-clone of the Chem Dawg...

In 1991, chemdog popped the first 4 seeds. [...] The 3 females were labeled "chemdawg" (now '91 chemdawg), "chemdawg a" (now chemdawg's sister), and "chemdawg b".