Postage Stamp Chat Board & Stamp Bulletin Board Forum
 

For my numeral postmarks collections I am looking for a cover with a meter mark with a UK numeral triangle postmark like shown in the picture:

It isn't a meter mark, it's a Postage Paid mark applied by the post office for mail posted in bulk, when the payment is not in stamps. These would always be in red, but would not normally have the numbered triangle which is supposed to be used for printed papers sent at the reduced rate for 'imitation typescript' items.

Use such as you show would be unusual.

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Ian Billings - Norvic Philatelics GB stamps info: http://www.norphil.co.uk - also /catalog for our ecommerce site, blog.norphil.co.uk, shop.norphil.co.uk and Ian_norvic on twitter

Thanks Norvic for your clarification. Does that mean that meter marks with a numeral triangle do not exist?
I am still interested in a cover with a red numeral triangle mark.

Meter marks with the triangle cannot exist. The Triangle is part of a Post Office postmark, the meter is something printed from a private Pitney Bowes, Neopost etc machine on the premises of the sender.

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Ian Billings - Norvic Philatelics GB stamps info: http://www.norphil.co.uk - also /catalog for our ecommerce site, blog.norphil.co.uk, shop.norphil.co.uk and Ian_norvic on twitter

I found this wrapper Delcampe. It has a 1 (1/2 d) pa(id) mark with 357 triangle from Hereford. It is sent in the years 1954-1956. The wrapper has a "Printed matter" stamp. This looks like normal use: Triangle cancels were used for Printed matter. The wrapper was delivered to the postoffice without a stamp, so the postage paid cancel was used.