I can't see any date stamps in the available pix, it may be "Kosher", it may be quite old, or of somewhat more recent manufacture.
My notes are:
It looks to be based on a Lee Enfield Rifle, not a SMLE.
Note the retention of the volley sights.
The band for the piling swivel looks a bit "Lee Enfield rifle"
The distinctive "hammerhead" shape of the safety lever looks like the early Mk1 Lee Metford pattern.
The cocking piece has a "Mk1 Metford" flavour.
The odd-shaped charger guide held on with slot-head screws.
The very odd profile of the lower surface of the butt socket.
The butt socket appears deeper and appears to be machined completely differently at the front face.
The rear-sight protector "ears" seem to be shorter than on a "proper" SMLE. Given that the Mk1 SMLE and it trials predecessor used "ears' built into the handguard, this feature is definitely odd.
The front sight protector is integral with the nosecap/bayonet standard but there is no indication of whether blade or barleycorn, nor of adjustment method (if any).
What is also interesting is that the bayonet adapter is similar in shape to those used on the US "trench guns" of the 12gauge pump persuasion. Question for the owner: does it take a SMLE bayonet or an Arisakabayonet - the "inspiration" for the '07 sword-bayonet?
The profile of the magazine case is of a much later style.
Maybe this is a very exotic Khyber-Pass special.