The overall technique is semi-wireless cloisonne. There are very few wires and they are extremely fine. While made of a shiny white metal, they are not silver. The iris is beautifully rendered, in semi-wireless technique. Note the colours in the petals that are well within the cloisonns as well as some very even shading within the cloissons.
The apple green ground is also beautifully even-toned. The only tiny problem is that the top rim has a little discolouration from exposure to dust and the like, which can be seen in one photo.
This is not unusual for a piece of this age. While of excellent quality, sadly this piece is unsigned. The item "Attractive mid-century Japanese cloisonne green and yellow vase" is in sale since Monday, May 25, 2020. This item is in the category "Pottery, Glass\Pottery, Porcelain\Asian, Oriental\Japanese". The seller is "bijutsu_japanese_arts" and is located in West Pennant Hills, NSW.This item can be shipped worldwide.