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It appears to confirm that your tube and trigger housing are British made.

the mag well is still in question...

To be technically accurate, it can be stated that all British manufactured Sten SMGs were manufactured during or immediately after ww2.

However, France, Belgium, Palestine/Israel and Indonesia are...

P.O.F. is Pakistan Ordinance Factory.

Unlike the Indians, the Pakistanis don't seem to have "wiped" the original manufacturers markings of their weapons.

it's probably an FTR of a British...