[CR] Worlds Largest Vintage Chainring?

This is a rather fascinating item for sale:

http://ebay.com/<blah>

* Stronglight 49 arm * Crank arm worn halfway through by shoe/toe strap * 50.4 bcd arm connected to ?sawed off? TA Pro Vis ring. * TA Pro-Vis Sawed-off to Homebrew adapter (3-pin) * Homebrew Adapter to a 70T TA Professional Ring

Is this the largest vintage chainring? If not, then certainly it's one of the strangest !!

- Don Gillies
San Diego, CA, USA