From RROCA-info

Number produced: 1,338.
Original Specification: generally similar to corresponding standard chassis: BC-R, BC-S1, BC-S2 and BC-S3.

Chassis Series	Year	Comments
BC 1-26 A	1951/53	BC-R
BC 1-25 B	1953/54
BC 1-78 C	1953/55
BC 1-74 D	1954/55
BC 1-9 E	1955
BC 1-102 AF	1955/56	BC-S1
BC 1-101 BG	1956/57
BC 1-101 BG	1956/57
BC 1-51 CH	1957/58
BC 1-51 DJ	1957/59
BC 1-51 EL	1958/59
BC 1-51 FM	1958/59
BC 1-31 GN	1958/60
BC 1-151 AR	1959/61	BC-S2
BC 1-101 BY	1960/61
BC 1-139 CZ	1961/62
BC 2-174 XA	1962/63	BC-S3
BC 2-100 XB	1963/64
BC 2-202 XC	1963/65
BC 2-28 XD	1965
BC 2-120 XE	1965/66