I have just checked my 1895 Edwinson Green BLE which has Whitworth chopper lump tubes, 3 Guineas extra (£3/3/0d) on top of the basic price of £35. No mention of the supplier of the tubes ( or frustratingly of the engraver).

Each tube has Whitworth’s Sheaf trade mark and wording clearly stamped but no tube number as such.

However the gun number 5XXX is stamped on each tube on either side of the base of the barrel loop.

It may be that to avoid having different numbers on the gun Green struck down the tubes at that point to remove the Whitworth number and apply their own.

By contrast an Edwinson Green BLNE from 1912 built with KRUPP—FLUSS-STAHL tubes has no tube numbers but just the gun number 6XXX stamped in one place near the Proof marks on the barrel flat.

Parabola