Rear Sight Pinion Question

Greetings. I generally hang around the M1 Carbine Forum but have a long troubling question for Garand guys. I want to put the original type rear sight on my (only) 784,xxx SA Garand and have seen conflicting (or confusing) reports on whether a long pinion is proper in this serial number range. Poyer & Riesch 3rd ed. says either the short or long pinion would be possible. I have a couple of good early T2 (8x36 w/ checkered elev. knob) long pinion lock bar sights but I will get a short pinion & repro T1 (6x40) lock bar if indicated. P&R says I am too late for a flush nut. I would appreciate educated opinions as to which sight (or sights) would be most probable as the original issue type for my rifle. TIA

Scott Duff's book "The M1 Garand WW2" has a data sheet on Springfield s/n 883325 (Oct 1942) with a short rear sight pinion, checkered elevation cap and knurled windage knob. Also he has a data sheet on Springfield s/n1006586 (Nov 1942) also with a short pinion and both the elevation and windage knobs being knurled. Duff also has a data sheet on SA s/n 793818 that has a short pinion, checkered elevation cap and knurled windage knob. These rifles all used the Type 1 lock bar too.

Winchester used the "flush nut" to Jan 1943 on production rifles but they were changed to the long pinion and lock bar.

Guts, there are two articles on the markings, one by Tony Giacobbe in the Spring 1993 GCA Journal and another by Tony Pucci in the Fall 1993 edition. This is a photo of the mark on my Mar. 42 .

https://www.milsurps.com/images/impo...IMG_1239-1.jpg