The M suggests that the sign is based on Futura Extrabold, although it's not an absolutely exact match.

Futura is good start but too many details look way off to me (/R, flat /G right side, /G and /S angled cut terminals...). Unfortunately, can't either name it or state if it's a custom lettering. Some alternatives I gathered during my search: Agenda FB, Mixage ITC, Whitney HTF, Swank Gothic BA (not bad), Solitaire MVB, Equip HT (far too recent but possibly the closest)
Quick'n'dirty' job, a retracing of the signage