I believe that would be an HHScott LK series amp - which were sold as kits in the early 60's to "hi-fi" enthusiasts. Those were the bee's knees back then, offering a lower cost alternative to McIntosh.
I'm not sure how it would do for guitars though. The tone stack would be totally different than what we're used to.
They didn't have any 60 watt amps, but the owner may be confusing the power consumption wattage as the output wattage. Most were 20, 30, 45 and 70 watts I believe (been a while)