Newzealand Rare Imperforated Pair Of 1d Rose Stamps

HELP- I have found these stamps which are a pair of 1d rose New Zealand stamps, postmarked 15 My 96. They are imperforated at the top and identify as SG 218d.
I am selling (up) and my Gibbons catalogoue shows a mint pair of horizontal imperforation at £1000 but nothing for the used.
Should I be selling on ebay or is it worth sending to auction?
Any sound advice

No, not without an expert's opinion.

You are only reading what you hope the catalogue says. The SG catalogue lists a vertical pair imperforate horizontal between the stamps and quotes a price for such a vertical pair. Your pair is not vertical, nor imperforate between.

Whether or not there was a source for an imperforate top stamp (booklet - looks a little early for that - or sheet margins that were not perforated), I do not know. With the stamp being centred low, this might be an ordinary pair that someone cut off at top: i.e., a mutilated pair of 218s (assuming it, correctly, has been identified as a 218).

So, in the most positive scenario, you would need an expert's certificate stating it is the lower pair of the imperforate horizontal stamp.

Even then, it will not make near the amount for a vertical pair that is imperforate between.

If it is certified, you might want to consider an auction and not ebay.

Like NSK, I fear that these stamps have been trimmed at the top. If you look at the top left you can see a trace of the original perforations.

Sorry to be disappointing.