Looking once more at the number: could that faint letter be an "R"? And would R10177 be a plausible number?
And since the barrel is apparently v.g.c. and looks much cleaner than the receiver: could it have been rebarreled?
But the previous post makes the most important point: regardless of who/when/where, it is a No.4 that is eminently fixable without fear of damaging the so-called "collector" value.
Refurbish and enjoy shooting with it!