I have 3 Japanese copies of english guns. Here is a Hamada that looks a lot like yours. It has a prince of whales grip and a single non-selective trigger. It also has an assisted opener.
I have another with no engraving that is by Mashiro. The third has no maker's name. I call it the Jonnaught because it reminds me of a Japanese version of the Connaught.
Here are some pictures of the Hamada.





Last edited by oganza; 02/18/12 06:21 PM.