Hard to say, no real way of telling by SN, Volvo doesn't have any cross references for year to SN.
If you go to this link, http://www.volvopenta.com/volvopent...lication_search/pages/publication_search.aspx and type in AQ130 you will find there were 4 models of the 130. A,B,C, and D and they years they were used. Knowing the year of the boat would help you to, if the engine was original to the boat.