Andy, Thanks for the photo. I would like one more though. The rear crossmember looks like it has a plate on top at each corner. Does this plate have two approx 5/8 holes that have nothing to bolt to? These might be M4 bipod supports. If so we know it was built as an M4. The M4A1 would not have these and they were not typically removed when converted to A1 config. I dug out alot of old papers on halftracks and I am seeing a couple others in your serial range that line up. The possible ord number stamped in the bogie crab really throws me though. Possibly the crab was from another halftrack. This number was usually placed here in a rebuild and since White only built less than 1200 units with a starting number of 1 OR 2 it seems unlikely that the ord number would have been that high. The highest number set I have is frame number 281853 as ord number 1707. That said your frame number does in fact fall into a group of numbers I had forgot about. I have 272339 and 272454 both being M4s and your frame number fits in between. Unfortunately none of these tracks had a confirmable ord number. I have a note that a photo showed hood numbers around 4060xxx for your group of frame numbers; but I didn't keep a source. The lack of original data plates to confirm ord numbers and White's lack of issuing ord numbers consecutively with frame numbers continues to prevent a exact hood number formula. ironbender,You have a rare piece that being the data plate. Too bad your hood number was lost as I remember you saying the blaster got to them before you did. If you can post a clear pic of the plate I would like to see the overstamp. I have a White M13 overstamped with 16.