For sale, Nova optics 15 inch F/4 parabola. central hole with 9 points mirror cell.
This mirror suffered an accident (secondary mirror crash on primary) and has two chips on it's surface, one about 1 inch by 0.3 inches, another one about 0.5 inches by 0.5 inches.
Even with these damage the mirror still gives good images and would be a good mirror for a dobsonian project.
Price with mirror cell $500 + shipping obo
I can provide pictures or show the mirror for San Francisco bay area local