Dendrobium ID. Anyone know the id and info? Is it really rare?

[opaline]

Opportunity to snap this one up as a cutting! Trouble is the word 'rare' is assigned to it and hardly ever applies other than a selling con/ advantage and a pain. Would like to include some treasures in my collection and if it is infact rare I certainly would make a space for this. Ironically, in the past dendros and me dont get on so i altered my approach completely for these and...well wish i'd done it before.