pulled feather lustre art glass vase

I've had this beautiful vase for about 6 years, and am still excited about it! It's 12" tall, 5 1/4" across the top, and 4 1/4" across the base. I have attempted to post a couple of pictures of the signature/ makers stamp, have not been able to decipher it, the extreme lusture and iridescent glaze make it difficult to make it out, and hard to photograph. Closest thing online were imperial to company lusture collection, but think it may not be a style they had, so perhaps a copy? idk what the imperial makers mark is for similar ones, please share. share if you can enlighten me, thanks so much!