It's had a hard and probably very interesting life and looks to have been reblued, but would be at the top of the line for quality when new.
The "25" date and adjoining marks indicate the barrel is apparently an ex-SMLE barrel put on at some point, no doubt to replace a worn original. The migrating solder under the backsight supports that conclusion.
On the bright side, you can pack it without worrying about damaging a pristine original.
The SMLE barrel would suit MkVII ball, but the original would have been set up for the 215gr. Mk.VI ball. The sights probably still are.
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