An 1890 Holland "Royal" is a trade built gun. Holland was a retailer then, their guns built for them by others. That changed gradually after the factory was built in 1893, and Holland became a true maker recognized for London "bests". Still, they continued to retail the work of others as well.
A great many "bespoke" guns were ordered from gunmakers that were, in fact, only retailers. The specifications were simply passed onto the trade maker that the retailer ordered the gun from. William Evans, W. J. Jeffery, Army & Navy, Holland (to the mid-1890s), and others are well known for this, and most in the London trade did so at one time or another. "Bespoke" doesn't mean "best" nor does it imply that the gun was even built by the maker that signed it.
A 1920s Holland Royal is a true London best, as is an 1890 Purdey SLE. The market recognizes them as such, and generally values them accordingly. Not so an 1890 Holland Royal. The market has never held them in anything like the same esteem. You're trying to make a comparison where none exists.
