Accidentally dropped this on concrete. No big deal it was already busted. They just don't make things like they used to.
the sandy tan M-3060 ish piece you found with the date code is definitely a Victor product and not an NL it is rather rare to find victor pieces with dates but they do exist... especially the M-4800 the mar4king you found reminds me of the ones seen on the crowns of M-4800 units.
also the firing rest and crown characteristics are typical of victor pieces...
Or could it be VICTOR? It's a bit of a poor marking, but I think that could be it.