Authenticating a Breitling

[jpgreenwood]

I have spent a few hours searching this and am still confused so any help gratefully accepted. I have been offered a Breitling Chronospace, 1996 model, SERIAL#A56012.1 10185.
The watch is 18 years old and shows age reflective of this. The seller states the following:
Movement replaced in 2009 (Aerospace movement) & New Crystal and Hands
Service & Cleaning in late 2012
Neoprene Travel Case (Gen) & Polishing Cloth
Chronospace Manual
Aftermarket strap & Bracelet
He has no proof or papers of this so cannot authenticate. Is there any way of checking authenticity as the seller is not in the same country as me and I cannot view it apart from the pictures he has sent. Its a good price (looking at similar on ebay etc). What would experts value this watch at?
I know its difficult without seeing it but a ball park figure would be a good starting point for me. Thank you.