Looking at the model number of a Motorola radio will tell you everything that you need to know about the radio, more than what might be in the description. In many cases, the description might actually be wrong, due to either misinformation, or ignorance on the part of the seller.
One of the best resources for Motorola radio information is at BatLabs. (www batlabs com) This site has information regarding the majority of the radios; mobile, portable, and base radios all have sections, as well as many of the interesting accessories that can be found for some radios. In general, the first letter determines the format of the radio. An 'H' denotes a handheld, a 'D' denotes a single piece mobile radio, a 'T' denotes a two-piece mobile radio, an 'M' denotes a motorcycle radio, an 'L' denotes a 'Consolette' or desktop radio. Any other letter can denote a base, repeater, or special purpose radio. In radios made before 1992, the next 2 numbers denoted the frequency range and the power. After 1992, these denoted the model of the radio.
Click here for the magic serial number decoder ring (PDF). The reseller is responsible to ascertain that the radio(s) are truly defective in workmanship and/or materials. This does not include close encounters of the forklift/steamroller kind, toilet dunkings or a brief swim in toxic chemical pools or cement mixers. Computer Based MDC-1200® Encoder & Decoder (Serial DB9 Version) Decodes and displays Motorola's MDC-1200® ANI and Emergency ANI in an easy to use Windows® based software program. The CAD-500 also encodes MDC-1200® for selective calling, radio kill, emergency acknowledge, etc.
The next 3 letters in models made before 1992 denoted the model and some special features. After 1992, it denoted frequency range, power, and the physical package (knobs, buttons, display, etc) of the radio. The next 4 letters or numbers generally denote channel counts, frequency steps, modulation type, and system type. These vary with model series. The next letter denoted the revision.
The first release has no letter, the first revision (second release) is designated 'A'; the 3rd release is 'B'; and so on. The next letter denotes any special packaging, and will generally be 'N' denoting the 'standard' packaging. If the model number ends in 'SP##' then it is a specially packaged unit, and must be looked up in the Motorola dealer's catalog.
This should get you started on what to look for when you are looking at either buying or selling your Motorola radio.