Wondering if these are Ingmar Relling chairs?

I found these on the side of the road in front of someone's house to be discarded. They are very sturdy, with the steel tubing structure. (There are two chairs, even though I only have one in the photograph)

I thought that maybe these were chairs designed by Ingmar Relling, but I've been unable to find any photographs that confirms that.

So, any insight that folks may have about these would be appreciated. I'm going to make them my side chairs in my office.

They have what I believe to be a manufacture date of November 29, 1978 on them.