Even more interesting is that I checked my copy of
Essential FIAT 124 Spider & Coupe And it also confirms what I found on Wikipedia. According to the book it would seem that 72 to 74 is a weird period for Manufacture. Designation 124bs1was made July of 1970 to September of 1972. 124cs was made for a short time from Sept 1972 to July 1973. 124 cs1 was made Aug. 1973 to July 1978.
So Bernie's 73 could be a cs or cs1 depending on the date of manufacture. it will be interesting to see if his has the same style of bumper mount as mine...I'm think it is a good possibility the cs has the same bumper mounts as mine. I swear my car has to be the last BS1 off of the line. According to wiki the first cs is number: 059592 and the last is: 063307. Mine is number:061785 But it is clearly marked 124bs1 for the model.
rob