Hi Dorrie
"Occupied Japan" items are much sought after by collectors and some of these lamps go for hundreds of $
Occupied Japan was stamped on Japanese made goods for the period 1945-1952
Kovels has a list, but bear in mind some of these prices are for the nineties and so would be
much higher today..
http://www.kovels.com/priceguide/kovels_occupiedjapan/
If you have any pics of them feel free to post or PM and I will see if they are in any of my reference books