New guy question.

I recently acquired a Lee-Enfield No4 Mk2 with a ser# of A168XX F 57 FTR. The receiver has 303 British United Kingdomicon IAC Alex Va just in front of the ser#. Can someone tell me the date for this weapon, where it was made and an approx value. The stock is in good condition and the finish is 98% on the bluing. There is a little light ware at the muzzle. I need the approx value/replacement for insurance in case of theft.
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