hmmm... trying to explain how to someone whos never seen any of the other monitors...
i mean most of the monitors will have a sticker on the back someplace. the older one is manufactured by ELO. but it may not be visible or accessible without completely unpacking the monitor. a bit of a giveaway is in the middle of the monitor on the right side it has a skinny red wire running off to the right side... it's usually taped down with yellow kapton tape. (i've posted a pic of this older style)
looked at a newer monitor's back at the top right corner of the monitor, you may be able to see a flat yellow ribbon cable with like 30 wire traces on it that disappears into the steel case. if you see that, it's a newer one.
do you know if this company would have more of these? some FRU's are hard to come by, as wait times from touchtunes is looking at about 3 to 5 months for waitlist for some parts.