I had a 'Custom Built'(marked on rib) Winchester Model 21, 32" VR, IM/F with shadow line cheekpiece and 'Hession' forearm. It did have a safety so might just have been a Trap but the IM/F would lead me to believe otherwise. I was never able to trace the provanace on the gun. You can read about it and view the pictures here http://www.model21shotgun.com/showthread.php?13-12-Gauge-32-quot-VR-Custom-Built .
The stock is simply magnificant and must be seen!
I shot it on Sporting Clays for a couple of years before trading it.-Dick