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@Smallfurry
Thats just over (by like a cm) the dimensions when 650 wheels become popular. I'd still guess at 700c though.
The axle to rim distance on a 700c rim is 622/2.
So assuming 45mm reach for brakes (39 - 49mm is standard for a road bike), you'd have a distance from axle to brake mount of around 356mm. Try mearsuring this to see.