What is M.R.A.? (can't tell if I'm looking forward more to the helpful answers or the wise-ass ones) Two South American Zeniths, the gold one with a local case:
You would think a physician would be familiar with a MRA watch, even if they only dealt with temperamental divas. Magnetic Resonance Angiogram
Interesting that the eBay listing shows that the seller is located in Uruguay, but charges sales tax to Florida residents. I believe the dial is original, though. Office in Miami, perhaps? gatorcpa
"Maestros Relojeros Argentinos," according to Nostromo2010: http://www.relojes-especiales.com/foros/vintages/zenith-135-a-81657/2/ I'll buy that... though I suspect it might really be "Maestros Relojeros Asociados," which is a google-able entity. Damn I was close with that first guess!
LouS is going have to scrape up some research funding for me soon. This mystery-solving ain't easy. Except for the Film-Pax thing... that was cake.
MMMD would seem to be on to something. I found this listing for a watch that has a box from "Maestros Relojeros Asociados" http://item.mobileweb.ebay.com/viewitem?itemId=350786805637&cmd=VIDESCPurchases made through these links may earn this site a commission from the eBay Partner Network Based on the Spanish forum post and this eBay listing, I would say that "MRA" would have been the Argentine importer for Zenith, rather than the retailer. gatorcpa
And here are the envelopes: Best Useful Answer: tie between MMMD for "Maestros Relojeros Argentinos" and gatorcpa for photographic documentation of "Maestros Relojeros Asociados" Best Wiseass Answer: also MMMD, for "Masterfully Redialed Again" Tune in next week for another episode.....