Vulcan’s 36L’s were very common and there are a lot of them around even though they were discontinued in the 90’s. I should say the L model as most were 60 inch ranges, not 36 inch. However, I have never seen or heard of a 571. 36L-77R is the base model, but it is possible to be some special. They were replaced by the VG and 90 series. Both also discontinued today. They were called the Economy line of ranges.
What is it you are looking for on this oven? We may be able to assist you with it.