...I just thought if you were going to buy a "special" keyboard from them, try to get one of the more rare ones...
...I was just explaining the difference between a 3rd and 4th gen Model M. What's your beef with me?...
I have no "beef" with you and I apologize if that was your impression.
I was simply curious regarding the subtle differences between the different Model M's and my statement regarding going off topic was an admission on my part that I knew my question regarding the Sabre was not on topic, depending on moderator interpretation. Clickykeyboards.com was initially mentioned as a potential resource for roughly estimating value, especially on an unused still in box specimen as described by the starter of this thread. I'm not quite sure where the impression was given that someone was wanting to buy a Model M. I am most definitely not. The only reason I would purchase another M is to replace mine when/if it fails and at that point, my interest is in actual utility plus a small bit of nostalgia, not rarity, hence my very much off topic question to you regarding the differences, if any, between the keyboards.
The detailed information with images you provided earlier regarding the gen3 vs gen4 was quite informative. I certainly learned some things I had not known before regarding the Model M. Again, I have no "beef" with you and I apologize if that was your impression.