When it was first spotted from the air, the E13A1 was thought to be an Aichi "Val" dive bomber on floats. It was given the Allied code name "June". Subsequent spottings and finally captured wrecks revealed it was a recon type and it was re-coded "Jake".
Watanabe E13A1 Type 0 (June)
Type: (mis-identified) reconnaissance seaplane
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