for each model and case material. So there will be a 5015-1130 and a 5015-3630 each with a number 1.
However, the number is not necessarily representative the actual quantity of watches produced. Blancpain does at times entertain request of dealers for special numbers. So, theoretically, it could be the case that only 400 pieces were manufactured, but a dealer requested five of them to have serial numbers starting with 1970 (e.g. because the dealer started business then).
Blancpain does not provide information on total quantity manufacturered (except for limited editions, where the info is given) or the specific year of manufacture.
Best,
Magnus
This message has been edited by Magnus Bosse on 2009-02-19 00:06:40