14 - 28. And more than light use, I'd say. I'm something of a dystechnic and rely on LBS guidance as to when components are past it, unless really overt symptoms are presenting. A trained eye might say it's an ex-freewheel, or it might say it'll be good for an age yet, I'm not being slippery when I say I don't know; no broken teeth or owt like that.
It was swapped over for a 6 spd freewheel because LBS said 7 was too tight a cluster in the rear drop outs of the 2nd hand bike it came on, not because shifting was sloppy.
This could all be academic if 14 is too large a smallest cog, but you can have it for price of postage and pint; I have no use for it.