Introduction And A Question

I have collected since I was a kid, but this is my first post here. I am a retired school teacher. I collect used worldwide from the beginning to 1965. I have been working on a lot of New Zealand stamps today and have come across an A18 1/2 cent green with the following perforations 14 X 151/2, which does not seem to appear in the Scott catalogue as far as I can tell. Any help would be appreciated.

Welcome.

A few hints: pictures tell more than words. A scan (or if not possible, a photo) of the stamp helps identify it.
A lot of collectors of British Commonwealth use the Stanley Gibbons catalogue that is much better for such areas than Scott. They will not know what A18 is.
From other posts, I think the A-numbers tend to refer to pictures and not stamp listings. Where multiple watermarks may have been used, this would not identify the stamp.

New Zealand did not have cents before 1967. The low "A18" number suggests a much earlier stamp. That would have been denominated in pennies. I see a 1/2d green in 1907 that comes in perf. 14 and perf 14 x 15. Unfortunately, I cannot say whether we are talking about the same stamp.



Again, the scan (or picture) would allow a much wider audience to help you. But a description (year, (colour,) what the stamp looks like), also would help.

A quick look at an SG "Commonwealth and Empire Stamps 1840-1970" shows that New Zealand issued halfpenny stamps in green between 1900 and 1940. The first one illustrating a monarch (the bipedal mammal, not the winged insect) appeared in 1909.

Hi Ike, welcome to the community

Welcome!

All I can add to NSK's explanation is that catalogue designations of perforations are usually rounded to the nearest half. Thus perf 15 includes everything from perf 14.75 to perf 15.24. Even if your stamp measures a little over perf 15.24, it may have been affected by paper shrinkage or bent perforating pins.

In other words, it's very unlikely that you have anything unusual. But an image would help!

Thank you, Bobcat 26 for the welcome. Thanks to all others for reading the post. Particular thanks to NSK who identified the stamp's being issued in 1907, and PJR, who added more information about perforations, information that I did not know.
I checked my Scott's 2020 catalog; it did not have a listing for the stamp's being issued in 1907. I checked an old Stanley Gibbons catalogue (1991), as suggested, and found the stamp to be #285 there. As for posting scans and/or photos, those are skills I will have to learn ... soon. Many thanks for all the help and guidance.