I've got a Pro Gen.VI that was upgraded to a VIa, upgraded to a VII, and finally upgraded to a VIIa to trade for your IIIa. Sorry, I couldn't resist.
Theta Pro Basic III upgraded to III A,
Just purchased a Theta Pro Basic III that has been upgraded to a III A. How can you tell? Physically all that is different is a silver sticker on the back that says "Version A". Is that it? Do the stickers differ, or is that the correct one? Please advise. Thanks for the help...Shoemaker.