relay powered voltage regulator ?

I have seen relays with a diode oriented both ways between terminals 85 & 86. There is a post w/ photos just about relays, I recall on this forum, discussing that and more. I recall the "wrong" orientation was on a relay base sold by an audio parts company. If a diode (or resistor) is internal to the relay, it is usually depicted on the side of the relay. The terminal numbers aren't arbitrary but based on a European standard (German DIN). I see the same numbers in my M-B wiring diagrams. However, when I compare relay numbering w/ the DIN list, they don't exactly match, so perhaps some numbers are an earlier Bosch numbering.