I am about to trade and get what is claimed to be a single Unitrade 41b (imperf)

The quality of the following image is so-so. I received it as a PDF format which was converted into JPG.
Either someone has cut the impoerforated pair in half, OR, done a real good job of cutting the perfs off maybe from #41
From here, is it possible to determine if this is a #41b or a fake?
