Mascootz

My Epiphone 350 was recently aquired at a public sale. My questions are in the model number, what does the NA mean? Then the serial number is Z6100023 I have looked for a production date but I could not accurately determine when be it was made. Can anyone help me? My picture kB exceeded the max limit to show the label. I will try one more time. Nope too large a file. Sorry.

My epiphone just shows PR-350 NA Does anyone know what the NA means? Also the serial number begins Z space 61 and 5 digits. Was this made in 1961? the 5 digits are very low numbers