After letting these flush out. I'm going to say they are not Monachello lemons. Monachello have a distinctive pointed leaf tip & the fruit are more rounded with a nipple. All of the rooted & grafted budwood you sent is producing a slinder & rounded leaf tip.
Here's a couple photo's of "true" monachello lemons.
Laaz: I got this as an unmarked tree (10-gallon container) from the estate of a fellow Houston-area citrus collector, James Francis, shortly after he passed away. I also had a supposedly-recent list of James’ roughly 150 citrus tree varieties, but this tree was unaccounted for on the list (as were others in his orchard - he had more trees than on his list!). I have tried to figure out exactly what lemon it is ever since. I started harvesting fruit from it yesterday, so I’ll add a few more photos of the fruit here. The lemons can exceed 1 pound each in weight (usually a little less), usually have 10 segments, excellent “Lemon smell” to the zest, a few seeds, only a fair amount of acidic juice. The fruit and the tree match very well the description of Monachello on UCR’s Citrus Variety Collection, but I could be wrong.
A few more shots of the tree and fruit, with a BH citron for comparison. It is easy to see the citron parentage in the lemon. My tree (giant multi-trucked bush really) is on its own roots and needs constant trimming to keep it under control (it can grow 3+ feet in a month!). As you now know, cuttings root very readily. Let me know if you’d like me to mail you a fruit to sample.
Laaz if you could have only one lemon which would it be? You have such a vast variety of them they’re all so beautiful looking I’m curious which ones your favourite. I’ve never even heard of the monacello im so glad I can learn more here