Hi Dennis:
Regrets I did not see your post for over a week, but, I have been a little busy lately. The exhaust system dates from the 1990's and is called a "Stebro" system , a company I used to think was American, but , in fact may be anything else too. They were an aftermarket stainless system popular in the 1970's for sports cars AND Detroit Iron as well. They were available in Canada in those days , but I am not certain of the date of this one as it was put on by "Bob" , the previous owner... He didn't drive the car very much.
Check "Stebro" exhaust systems .
Hope you are notified of this response.