I have some Sheffield razors with that type of scales on them, all have lead wedges too. I think it is just a matter of how they were finished at the factory and how dry they got over the years.

Anyway had a look at my Thomas Turner and a W&B with similar scales but less polished. Looking at the beveled edge on the scales with a 30x lighted loupe and both seem to have grain with the W&B having a couple of small flea bites. From that I take it to mean that both sets of scales are horn. Nothing as conclusive as using a hot pin though.

Bob