The real question would be, why? Not worth that much trouble for just for a trigger hung on the body. Presumably done to give adequate strength for a more powerful cartridge. Looks no later than the 20s and perhaps earlier as mentioned.

Best guess is a trade sample which would have been shopped around to countries that already used a larger, more powerful cartridge than the LE could accommodate.

Or perhaps offered to countries that had been buyers of the LE and were being tempted by the purveyors of rimless cartridges and Mauser actions? A sort of "we can do it too" design.