The 1968- 1971 models were glass bedded at the factory. They also had a small brass screw threaded in to the head on each side directly behind the lockplate screw. Other than that, I haven't observed any difference in stocks from the 1890's to the 1940's. After glass-bedding and repairing cracks on 20- 30 LC Smith stocks i have yet to observe any hand fitting like you might see on a Westley Richards, etc. From what I have observed the inletting was entirely a machine operation and they erred on the side of removing plenty of material. As evidenced by the photographs the inletting was haphazard at best. I have never heard how many stocks their equipment was capable of shaping at a time, but some definitely came out better than others. The only way to know if you have a decent stock is to remove it and examine it. Lots of times you won't even know it's cracked until you soak it. The tang, trigger plate and lockplates prevent the cracks from opening up if the screws are tight but they are cracked, nonetheless. American walnut is vastly inferior to Englsh; like comparing pot metal to steel. Dense, hard English walnut is far less likely to fail.