My thoughts
Trade it to me for a less "collectable" one so you won't feel bad about having it in your pocket!
At times the early Farmingdale guns are hard to come by and seem to be worth more than new production guns. At other times they don't seem to sell at all.
I think its a nice and would put it up.
" based on the very rare R9S vs. a less rare no "R" designation" I'm not certain that the no "R" is less rare than the "S" marked slide. I think (yep, think) ALL the sited pre-R guns have a "S" marked slide and I know there are quite a few "R" prefix serial number guns with the "S" marked slide also. That being said they are both VERY rare in the big picture.