It’s a model 1890 special order in the semi-deluxe configuration.
If requested, the wood could be upgraded but this doesn’t appear to be. I haven’t yet disassembled it, but usually the upgraded wood guns have xx or xxx stamped into the side of the tang medal, which signifies the level of wood (x:fancy or xx:extra fancy).
The pistol grip checkering on this (and other semi-deluxes) doesn’t extend to the pistol grip cap like the deluxe models. Essentially the only difference between this one and a typical production 1890 is the pistol grip buttstock and the checkering.
For deluxe vs. semi-deluxe reference: