If I am not mistaking is refering to a Viking Designer 1 hoop and they are avaliable in diferent sizes. Which size are you looking for?
I was looking at patterns that were designed for a D1 and didn't know how that compares to my Janome hoops.
I think it's a hoop for the Viking also. Go to their site and check out hoops for different machines. Should give you the sizes. Link below. May have to hunt a bit, but it should be there.
Could it be the Viking Designer 1 ?
If you tell me your hoop sizes I will check the Designer ones in my Embird program and compare for you.
hnr, M