This is a 1912 Caille RBM and the only one I know of. There are several design differences from later examples, i.e.

I've included some sales pics showing this motor.

IMG_4399 IMG_4400 IMG_4401 IMG_4402
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IMG_4419 IMG_4420 IMG_4429 IMG_4435 copy
IMG_4437 copy IMG_4456 copy