Hi Purists !
Just purchased (not yet received) this Blancpain with caliber 21 in 36mm.
Never seen this model before with an Officer case back...
Very interesting in my opinion... Good size (at least for me), The excellent caliber 21 manuel winding you can find in PP (215) or VC (1003) and this officer case back...
But no reference or history...
Help ! 

