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Those are commercial proof marks, British Laws requires rifles sold as surplus on the british market be proof tested before sale, even if they are to be exported at a later date.
Most of the SMLE and other rifles coming from England had to be proof fired and marked. After 1968, the "England" stamps complied with USA import laws.
However, other countries that used SMLE rifles that were bought by the major arms dealers did not have to comply with the British proofs. You will find Australian, Canadian, Arab, and other European Countries that used the SMLE did not stamp the Commercial Proof Markings on a lot of their Surplus rifles.
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