Kwmpa
The top photo clearly shows the 'Horseshoe' toplever of the P Webley patent 'Screw Grip' so the gun definitely originates from Webley & Scott (as they became in 1897).
The lack of PATENT engraved on the horseshoe also points towards the gun being produced after the end of the patent protection (1896) but that is not conclusive as I have seen ones from after with, and ones from before without!
I have consulted my dating matrix and I regret there is no helpful information about the 67** numbers but I can tell you that 6685 was made in 1910.
The Spanish guns seem to have happened in the 68** to 7*** region but later guns often carried the trade maker's number and are undateable.
This gun is definitely prior to any proof house dating stamps.
