Is that a faint "responsibility" mark I see to the immediate left of the fineness mark? If so, any chance of seeing if you can make out the number inside it? Movement photos might help narrow down the date range too, although it looks like a pretty classic 60's design. An import code on the balance might help too.
There was a import company in the states called "M-K Enterprises" in Chicago that was active in 1954...no indication that they ever used that as a watch brand though.
A forum community dedicated to watch owners and enthusiasts. Come join the discussion about watch collections, displays, watch winders, accessories, classifieds, and more! We welcome all manufacturers including Casio G-Shock, OMEGA, Rolex, Breitling, Rolex and Tudor, Seiko, Grand Seiko and others.