I forwarded this closed bolt material to James Ed and he is quite perplexed, saying that they'd prepare any variation if a customer wanted it - and had deep pockets. But the L34 marks (or L2A3 markings) were there to indicate that the gun was identical to the UKmilitary L34 and/or the L2A3.
In this case, the closed bolt gun is definitely NOT the same and nor would many of the parts be interchangeable. It is clearly not a made up 'fake' but certainly not one that the owner knows about or recalls. Shame engineering director David Howroyd isn't here to add his 2c's worth.