Do you mean Lion? Lion is 10.7 & Mountain Lion is 10.8
I think your only hope if you didn't create a copy or bootable backup is to boot into Recovery mode with CMD+R and hope there's a Snapshop of Lion for you to rollback too.
If it's supplied with Mountain Lion out of the box, you'll likely have issues with installing Lion, unless that model started off with Lion. Be better off just picking up an older one.
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