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Hello Cycle_Tourist,
suspect this may be a model from ~1974
here is a mfr catalogue page for the Carrera of the early 1970's (~1971) -
here is mfr. catalogue page showing the Super Carrera & and Carrera Special of 1978 -
you should be able to locate date code markings on the cycle's components. here is a guide to the markings -
http://www.vintage-trek.com/component_dates.htm
suggest you first check backside of SR APEX crank arms and then check portion of handlebar stem which is down inside the steerer...
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frame's fork crown is Agrati "BRIANZA" pattrern and is item nr. 000.8038
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will be interested to hear if your shell is 68mm Italian thread or 68mm BSC thread & and if steerer & stem are .833" or 22.2mm
early steerer/stem size was the .833
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