What's interesting about these is that they're TRK Large Crowns. That's a mold that's not very common, and while it's not as widely desired as the TRK Small Crowns, a lot of us (like me!) think it's a particularly classy mold.
Most Large Crowns are hotstamped, as are these. There are some inlaid Large Crowns but they're pretty rare. So most people who have a Large Crowns set have hotstamps. EXCEPTION: Now that CPC can make Large Crowns (which just started a couple of years ago), people have been getting newly-made Large Crowns with custom inlays. But that's different from vintage sets like the one here.
You
could mill these and put a label on them, but from an aesthetic standpoint I think most people would rather leave them as-is.
I don't think there's anything in particularly significant about the A-1. I couldn't find an example of this chip on Chipguide. Maybe someone else knows more about it, but it's probably just some hotstamp that some customer wanted on their chips.
If you want to see more chips like these, go to the Chipguide Query page at
http://chipguide.themogh.org/cg_query.php and in the "Mold" box select "LCrown". Lots of different such chips have been found, but it's not all that common to find them in a playable quantity!
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