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The two you picked are Japanese made post war classic porro prism binoculars. As long as they are well collimated and mildew free they will be work as astronomical binoculars. They do lack the more modern lens coatings of today so brightness and contrast will not be as optimal. The eye relief will also be restrictive. They are not waterproof.
Post war Japanese binoculars had strict quality controls in place to ensure continuity of optical and build standards so it is rare to get a bad 'one'. They are not robust as such however and have to be handled in accordance.
Japan produced 100's of porro binoculars under many names and many households worldwide would have had a pair at some stage. The Chinese over they past decade or two now supply the majority of optical instruments for world consumption. Your binoculars should still give better images then the Chinese 'entry' level mass market binoculars that have flooded the markets over the recent years.
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