An Post has launched a new national stamp which marks 50 years of Guaranteed Irish supporting Irish businesses.

The Guaranteed Irish symbol is one of Ireland's most recognisable home-grown emblems.

The organisation has been working since 1974 to encourage shoppers to support locally-based businesses displaying the Guaranteed Irish licenced mark when shopping in-store and online for goods and services.

The new €1.40 stamp covers postage across the island of Ireland.

Designed by Dublin-based CI Studio, the stamp captures the essence of Guaranteed Irish in a simple and playful way, with the iconic symbol rendered in gold.

An Post CEO David McRedmond said Guaranteed Irish's work promotes all businesses based in Ireland, supporting fair working conditions and a growth economy.

"In this regard Guaranteed Irish and An Post have a lot in common and together we are helping build sustainable Irish businesses and communities for the future," Mr McRedmond said.

Guaranteed Irish CEO Brid O'Connell said the company was delighted with the support of such an iconic national brand such as An Post, which also champions sustainability amongst its members and customers' businesses.

"Guaranteed Irish has supported the Irish economy for the last 50 years and looks forward to sustaining this focus for the next five decades," Ms O'Connell said.

"While we have evolved to represent our members, the support from businesses such as An Post has been steadfast and the new stamp is a really fitting way to celebrate this together," she added.