Hi Oganza! I just received this e-mail as a response for my request of information from Hamada & Sons on this shotgun:

Dear Mr.Ferreia.

Thank you for your E-Mail.
I think this shot gun were made by Matsui Gun Shop in Tokyo.
May be this is manufactured in 1950 & 1960.
Mr Matsui ceased his businness about late of 1980.

We are sorry our reply is so delay.


Shugo Hamada
Hamada & Son Ltd.

Do you know anything about this Japanese shotgun manufacturer? I did a web search and came up with this shotgun on sale at a shop in New Zealand:

http://www.guncity.co.nz/12g-matsui-side-by-side-xidp234507.html

There seem to be similarities to my shotgun but the image is not very clear unfortunately...

Last edited by LuisHunter1; 09/03/13 08:10 PM.