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Wow this?is interesting.? First off there is little resemblance of this lathe to the other three prototypes we have seen.? For one the other three have four bolts holding the front bearing cap on wear as this one only has the more typical?two.? There is very little of this lathe that resembles the more common Daltons. What does resemble other Daltons is one the shift lever for the end gears.? The end gears themselves look like the standard Lot 6 and Dalton 9 change gears.? The patent Dalton spring clip retainer for holding the?change gears in place as one of them is still on the lathe and I can see in another position where one would have fit. The four position change gear box is very similar?two one used in the late teens by South Bend lathe but not used on any other Dalton.? The information tags are for sure standard Dalton items and look like ones on other?Dalton lathes.? I see the?shift handle for the back gears is missing but I see the standard Dalton slit bushing that the back gear shaft passes through.? The back gear setup looks to be standard Dalton design.? I am going out on?a limb here?and say this lathe was built before 1925 as it has a NY address on the tag.? After 1925 it would have been Sound Beach. .The Tee slots on the top of the saddle were very common on lathes of this era?especially on lathes of 12 or 13 inch swing or more.? You are correct they were meant to be used in setting up between centers boring? operation to items secured to the saddle. South Bend used a very similar setup to bore headstock?and tailstock castings in their factory. One other thing is the back gear guards.? These are one piece castings and on the Lot 6 and Dalton 9 they are two piece as well as on later made Lot 4 and 5 lathes.? This makes me think this lathe was built very early in Dalton's history.? Maybe even before 1915 as the Lot 6 came out in 1915 and had two piece back gear guards from the beginning?of production. The dial rings on the cross slide and compound slide also look much like ones used on all other Daltons,? It will be interesting to find out what the spindle nose thread is on this lathe.? My bet it's going to be 1 7/8-8? as used on the Lot 6 and Dalton 9 lathes.? ?For sure you have a very interesting piece of Dalton history.