[Rotary Evolution]

mazda did not build the engines without a stamp, most manufacturers stamp the engine to match the vehicle it is going into. rotary engines have always had a serial number stamped on them with no home, so to speak. once an engine is installed into the car it is recorded and only mazda corporate can verify the vehicle it went into.

there are little differences in engine configurations to tell where the engine usually went to, like say europe, japan or the americas.