Hola,By chance I have entered this forum. I am going to try to answer several questions, even though many years have passed.For oldrzym. 81 589 584, Possibly October 5, 1942.For 1958 M274, Joe, Can you send me a copy of your B.C, 81 560 119, to my e-mail, please? jpelaez15@yahoo.esFor Peteros...