that violate the guidelines or Terms and conditions of Use
of the Missing-lynx.com discussion groups will be erased,
and repeated violation of this policy may result in termination
of the violator's account.
Yours is a typical first reaction, Owen. Yes, the history is complicated...but it is getting better documented all the time. Here's how I would start: Pick a time period first. Then, an operator. For much of the time IDF will be the only one, but from the latter seventies the Lebanese militias are in the mix and from 1983 Chile as well. A wet-stowage cast hull with HVSS and Cummins engine pretty much guarantees a post-1962 time frame and probably closer to 1967. There are variations in the number of stowage boxes on the sides, as well as how the engine deck and exhaust are configured over time. Several of us here (myself included) can help you out there, so get in touch offline if you wish.
I don't know how many wet-stowage M4A1 hulls were converted to M50s, but I suspect there were relatively few. That was the preferred hull for the M51 conversion program, so I have to think that the M51 line had priority for that hull type.