Well that certainly would be the first clue.

Since my last note, I have asked a few more people, some of whom are real bike people, and I still have no information.

But given the heavier nature of the bike, the idea about its being a city bike is probably right. Does it have a geared hub in the rear, or a derailleur? If it is a hub (probably three, four, five, or seven), and a single chainring, that would be rather definitive.

Cheers...Gary