Here are some specs from the Bottecchia Special Model. It is noticebly different.
late 60s - late 70's 23" Bottecchia Special frame specifications
Frame/fork tubing: hi-tensile steel
Frame/fork construction: Brass brazed, Bocama lugs, stamped bottom bracket, flat crown fork, stamped dropouts and fork ends
Size, inches: 23
Seat Post Size, cm: 26.4
Seat Tube, cm: 58.5
Top Tube, cm:
Chainstay, cm: 43.6
Wheelbase, inches:
Head Tube Angle: 71.5°
Seat Tube Angle: 73.0°
Trail: 54.5mm
flop factor: 16.40 (moderately high)
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1959 Bottecchia Milano-Sanremo(frame), 1966 Bottecchia Professional (frame), 1971 Bottecchia Professional (frame),
1973 Bottecchia Gran Turismo, 1974 Bottecchia Special, 1977 Bottecchia Special (frame),
1974 Peugeot UO-8, 1988 Panasonic PT-3500, 2002 Bianchi Veloce, 2004 Bianchi Pista