Hi, are you sure your movement height measures are correct? There's no way a chrono movement would have just 3mm of height. Revise your height measures.
The flat bezel case ( 34mm x 31mm x 3mm) number 709 is a Breitling case and the correct movement for it is a Venus 175 like this one:
As to the regular bezel case I can't tell you for sure until you tell me the correct height dimensions.
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