Wes,
You are asking about what is basically the commonest, and least expensive, of the 3-row models built by the firm variously known as Bastari (started in 1949 by Dr. Marcello Bastari), then Stagi and (since 1992) Brunner. This, their W-15 model, is still in production today and you can see it here in their catalogue: http://www.brunnermusica.com/concertine.htm
But if it has the same brass mechanism, and the reeds are mounted the same way as in Ken's, then it's an early version.
A photo is always a huge help with an enquiry like this...