The Cohiba line was not produced in any shape or form until 1978 and that was in a very limited and not for sale quantity, in Cuba. In 1982 the line became available for sale, in Cuba. The non-Cuban Cohiba brands were introduced in 1990-91. The only Cohiba Triangulare I know of is the Red Dot Cohibas. These were not produced until the late 1990's.
As for the other brands listed. If they are indeed from the 60s or 70's they are worth far more than what is being asked. It would be more worth your father's time to contact Christie's auction house in the UK.
Post some pictures here of the boxes so we can actually see what is being sold.
As for the Dunhill shop, it is at 57th and Park Ave. in New York, but they will not be showing anyone else's cigars to anyone without prior permission.
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