Riv's measurements are C-T, so this would be the 63 cm. Let's say the difference between C-C and C-T were 1.5 cm. (That's just an estimate without actually looking at a frame).
63 cm C-T would become 61.5 cm C-C, which would be 24.2" after converting. So even if I'm wrong on the 1.5 cm part, that's likely the size.
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