Pete...I have looked at several original invoices for 44 Magnums from 1956 through 1965, and none of them specified the type of stocks or the type of wood the stocks were made of. Goncalo alves is the "standard wood" used to make target stocks used on the 44 Magnum and later the Model 29 and its model variations, so while correct for your gun, the Goncalo alves comment often may fall into the category of boiler plate, or Roy will put that in the letter if that is what you tell him are on your revolver.

See the invoice for S131000 below as an example (this 44 Magnum has stocks made of rosewood).

Bill