Well, it's certainly an original dial and a nice watch. The case is aftermarket, probably South American. The hallmarks on the outside are the dead giveaway that it isn't a Swiss made case by Longines. Most times, stainless watches were sent to SA, and then the dial, movement, and hands were installed into locally made solid gold cases. What makes me nearly 100% sure of this is the period correct (late 50's / 1960's) and probably original stainless steel Longines buckle. If the watch had come from Longines in Switzerland in that case, that buckle would at least be gold plated, or solid gold, in the same color as the case. Anyway, the buckle alone is worth at least $50 and probably closer to $80-$100. Nice that it has the box. Odds are, in order of most likely to least likely, that it's powered by a 30L, 23Z, 12.68, 28x, or 370 caliber.
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