Question about forend checkering patterns on BH(E)'s

[Craig Larter]

I have a BHE bottom gun 111xxx, circa 1902 that letters as a BH. It now has ejectors and forend checkering that is not consistent with BH"s made in 1902. The top gun shows what would be typical of the early period. When did Parker go to the full forend checkering on the BH(E)'s?? Can I assume that the conversion to ejectors was made during that later period and when would that be??? I assume when a gun was converted to ejectors new forend wood was required?? Thanks Craig