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A1 is 841mm x 594mm and 2 inches is 50mm...... so, on its longer side, you'd want 841 + 2 x 50 = 941mm (37"), and on its shorter side you'd want 594 + 2 x 50 = 694mm (27.4"). Overall, then, that's 941mm x 694mm (internal measurement). In old terms, that's 37" x 27.4". That's the strict measurement - you may find frames in shops that round those numbers up a fraction to allow the matte.
Sorry.... Chris replied while I was doing the sums!
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