Your chronograph is indeed an early seventies Carrera 1153S. The bracelet, however, is from a much later date, perhaps early eighties. I don't think Carreras were ever sold with this kind of bracelet.

Aesthetics aside (it could use a little LTC), components as crown, pushers, face, hands, tachy ring and even the acrylic crystal look original. Watch seems to be working; is the chronograph operating as well?

According to OTD'd Price Guide, value of a 1153 could be between US$1800 and US$2200.