unusual setup

my father had someting similar to this in one of his cortinas about a hundred years ago , i have never seen one since .
it might have been top secret stuff in its day ??
after all it did limit the slip ?????
this diff would be just the ticket for the true enthusiast to have the car in
original spec of the day
http://cgi.ebay.com.au/Escort-LSD-Diff_ ... 240%3A1318
it might have been top secret stuff in its day ??
after all it did limit the slip ?????
this diff would be just the ticket for the true enthusiast to have the car in
original spec of the day
http://cgi.ebay.com.au/Escort-LSD-Diff_ ... 240%3A1318