Hello, I have these 3 New Zealand revenue stamps from the period where they could be used either as postage or revenue, The first two have pen cancels as well as a large oval cancellation. My assumption is that these were used for revenue purposes and not postage; is that correct? The third stamp has a circular cancellation with a visible NZ. My Barefoot catalogue says there were circular revenue cancels that were larger than the postal ones. Can anyone say for certain if the last stamp has a revenue or postal cancellation?

Thanks to all for replies!