Hi, My s/n both start 1709A and do not have the FCC ID on them , in place it says 136-174MHz and 400-470MHz. I have had mine for a couple of years so I assume yours are newer. Just looked it up , I purchased mine in Oct and Nov 2017 via Amazon. With that logic does that mean the first digits are the year and possibly month of manufacture? i.e yours are jan 2019 and mine Aug 2017?