The last thing you acquired, #11  

Eva Zeisel One-O-One
Strolling through the Bloomingdale's that's scheduled to close in March today...and in the housewares area...what did I see? a table of Zeisel's long discontinued One-O-One from Royal Stafford.
I grabbed the one teapot, a sugar bowl with lid, a creamer and the one vase they had. All of them were marked down to $19.99 and I got 50% off that...so the 4 pieces cost me $42.91!
Such a deal!

re: American of Martinsville End Tables
Can't answer your specific question, but I do have the tall/narrow and short/wide dresser from this collection, with 2 end tables and a wall mirror. Basically the bedroom set.
I have never seen your exact pieces, but I haven't ever seen anyone post anything from this collection before for that matter, so it's nice to see what else exists out there. The pulls are what give it away. Very unique and well made.
I think these are from the early 50's, if my information is accurate.