Dr No[Moderator Omega - Wristscan]
37503
My 2Β’ worth of speculation . . .
. . . is that the Peruvian agent at the time was actively promoting Omega to well-heeled customers.

The Air Force of Peru ordered Railmasters with 'Flightmaster' printed on the dial. How many, I don't know, but suspect fewer than the legendary P.A.F. I believe the dial was the only unique aspect, unlike the P.A.F. which had double-signature verification.
Who knows, maybe the Ranchero was an attempt to entice the Peruvian Cattleman's Association.
π΅πͺ