The bulkhead material is different from that used on the dash, which is likely to be Marcasite.
I'm unaware of any Esprit S1 or S2 having green interior, but the black/anthracite (ie silvery black) Marcasite turns green with age/UV.
As far as I've seen the bulkhead of a Marcasite trimmed car is usually the same material as the centre console arm rest and the door card inserts. On a black interior this is black and resembles the material in your photo. This is available now from UK trimmers. It looks virtually identical, but being a modern fabric will be of higher quality compared to the 1970's synthetic fibres.
You are right about Marcasite. It's basically a type of tight, mono-pile synthetic velvet, on a woven synthetic backing/substrate. It has the properties of being able to tightly wrap interior pieces such as the instrument binnacle without folds. Unlike most modern substitute materials. It is thicker and less flexible than the material used on the bulkhead material.