Reference for carbine brass stamping?

[Reload]

In another thread USGI asked if any of the cases I recently accquired are USGI. I think the answer is yes, but not sure.

Some of the steel cases are marked EC 43. I believe I've learned that this is Evansville-Chrysler made in 1943. Is that correct? Also found some LC-56, is that Lake City 1956?

I could go through these and bore the heck out of you by posting all the stampings I find, but was hoping there'd be a reference for stampings somehwere. I've done several searches and can't come up with much. I'd be happy to post what I find if anyone is interested.

Thanks

Edit:
Just to bore you anyway...

I have 29 steel cases marked EC 43. The rest are the LC 56

I started poking around in some of the brass cases. Found a couple marked EC 4. Very clear, no missing number, just a 4. Also found one marked WCC 44. Winchester?

Most I've found are LC 67.

So, are any of these rarities? Are the WWII cartridges worth leaving, or just treat them as the others and reload them? What about the steel cases? Is there any value here, or are they just neat relics from an historic period?

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