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If that is the original serial number, there should be a letter prefix. My source shows 22999 would have been made at Fazakerley, but should have a single letter or a double letter prefix.
I have never seen the "ROF" without an indication of which one; could it be "POF" (Pakistan Ordnance Factory)? If so, they would have rebuilt it and that concurs with the"FR" which was used by both Pakistan and India to indicate Factory Repair, a shortened version of the British FTR (Factory Thorough Repair).
POF never made the No. 4 Mk 1, only the Mk 2, but they repaired many of the older rifles. Repair in both countries often meant removal of the original serial number and the assigning of a new number.
The ".303...TONS" marking is the British commercial proof mark, consisting of the caliber, chamber length and working pressure of the round; it indicates that the rifle was sold on the commercial market in England at one time, possibly to an American importer.
Jim
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