I believe this item is from the Showa 40s to 50s (approximately 1965-1975). My grandmother, who used to sew kimono, told me it was "Oshima," so I'm sure that's correct. As you can see in the photos, the basting threads are still attached, so I believe it's unused. It looks very beautiful, but please be aware that it is old, so there may be some age-related wear and tear.