Found this on Barchetta factfile.
1.Q: What models are there?
A: Currently only one, divided in submodels:
183.829.0 - 1750 MPI 16V CF2 (the standard 16v with "183A1" engine)
183.809.0 - CF2 Club Italia
183.819.0 - CF2 Limited Edition 1998
183.839.0 - CF2 Japan
183.849.0 - CF2 Limited Edition Japan
183.859.0 - CF2 Limited Edition '99
183.859.0 - CF2 Limited Edition '99 Japan
183.879.0 - CF2 Lido 1999
183.889.0 - CF2 Riviera 1999 for Germany
183.899.0 - CF2 Riviera 1999
183.520.0 - CF3 (new ECE F3 compliant "188A6" engine)
183.530.0 - CF3 Japan
183.570.0 - CF3 Lido 2000
183.580.0 - CF3 Riviera 2000 for Germany
183.590.0 - CF3 Riviera 2000
•Q: How old is my car?
A: This list will give you an indication (sometimes a chassis was held back a month or 2), based on your chassisnumber.
1000 2nd week of February 1995
4500 1st week of May 1995
7500 1st week of July 1995
11000 2nd week of October 1995
14000 1st week of December 1995
15000 2nd week of January 1996
19000 4th week of April 1996
20000 4th week of May 1996
21000 June 1996
22000 July 1996
23000 August 1996
24000 December 1996
25000 February 1997
27000 March 1997
29000 May 1997
30000 June 1997
32000 September 1997
33000 October 1997
34000 December 1997
35000 March 1998
37000 April 1998
38000 June 1998
40000 October 1998
41000 January 1999
42000 April 1999
44000 June 1999
45000 July 1999
47000 October 1999
47300 January 2000
47500 February 2000
48000 March 2000
49000 April 2000
49500 May 2000
50000 June 2000
50500 July 2000
51000 September 2000
51250 November 2000
51500 January 2001
51750 February 2001
52000 March 2001
55400 May 2002