The Savage No. 430 over/under normally came with a really nice stock of crotch figured American Black Walnut, and a Jostam Anti-Flinch Recoil Pad. So, with a plain walnut stock and a butt plate, it has probably been replaced.
In 1937, Savage introduced a new series of Savage shotguns, the 220 hammerless single barrel, the 320 side-by-side double and the 420/430 over/under. The Savage catalogues state they would begin shipments of the 420/430 in 12-gauge by May 1st and the 20-gauges by September 1st. The 320 double was only listed that one year. Also, that one year 1937, Savage's subsidiary down at Chicopee Falls, Mass. offered a Stevens 500 side-by-side double Skeet Gun with a beavertail forearm and a non-selective single trigger. By 1938 the 420/430 could be had in 12-, 16-, and 20-gauges, extra sets of barrels and a non-selective single trigger was offered. In addition to the fancy crotch walnut, the 430 also had a Jostam Anti-Flinch recoil pad. The 420/430 remained thru the 1941 price list, but were gone by the 1942.
From the 1938 Savage/Fox wholesale Price List --
These guns were cheaper then a Marlin Model 90. They listed for about half what a Browning Superposed Grade I listed for and less then a third of what a Remington Model 32A "Standard" Grade listed for. So, you got what you paid for!!!