If an HP was ordered with target stocks (per the option in the All Model Circular) it would have been shipped with target stocks made of walnut with the standard checkering pattern. IF a person wanted an HP with special oversize target stocks made of Goncalo alves (or a few in rosewood, i. e. coke bottle stocks) the order would have to specify these stocks. The invoice for an HP shipped with regular target stocks made of walnut would state something like, M28, 357 HIGHWAY PATROL 6, B, TS. If the stocks were coke bottle stocks, it would state something like M28, 357 HIGHWAY PATROL, 6, B, GONZ TS and the price would be slightly higher. S&W used GONZ to indicate stocks made of Goncalo alves.

I am confident your Model 28 shipped with regular target stocks made of walnut and the coke bottles are an after marker upgrade. I have never seen a pair of coke bottle stocks made of American walnut.

Bill