Ruth Mentions Type II SG Stock marked OI/40A, Found OI 39 A

[painter777]

In War Baby, In the summing up Saginaw's Carbine Program,
In the stock section page 435, Larry mentions:

Type A, Variation 1 with the I cut Oiler Slot (Type I) was found with RMC 40 A

Type A (M1), Variation 2 with Oval Oiler Slot (Type II) was found with sling well marking of OI 40 A.

Type A (M1), Variation 2 with Oval Oiler Slot (Type II) was found with sling well marking with upside down U and a 7.

Type A (M1), Variation 2 with Oval Oiler Slot (Type II) was found with sling well marking with RSG and 9 A.

Type A (M1), Variation 2 with Oval Oiler Slot (Type II) was found with sling well marking with 75 E RSG

Type A (M1), Variation 2 with Oval Oiler Slot (Type II) was found with sling well marking with RSG 88 F

Type A (M1), Variation 4 with Oval Oiler Slot with modified slide clearance cut and was found with sling well marking with RSG 105 B. This one noted use during late production.

There is no mention of Serial numbers ranges to the letter/number codes I could find.
Which leads me to think he was just using observations from examples he looked at.
Am I wrong ?
Where was Larry heading with this information? Did he believe the letter/number codes used by Saginaw SG had some rhyme and reason to them, maybe a increasing number and letter as production moved forward ?
IF Based on increasing number/letter codes... Could these have been based on Deliveries as accepted by SG?
I've often thought the added markings could have been applied by a In House Stock Inspector at Saginaw, before assembly commenced in that stock. Assume they would have inspected deliveries and possibly used different gages and jigs to inspect them with. Maybe numbers/letters were related to order numbers/invoices. Letters to a inspection section and or shift.
I think back to the picture of a Robert Irwin worker checking the actions fit in a new made stock.
And would think SG would double check before wasting any labor on a stock to be found later to be out of spec


There is also no mention of the Type II TRIMBLE TN stocks that were used by Saginaw SG.
2 examples pictured below.

I'm asking because I happened across a older post here today from a member in Europe that showed his SG 3.37M that appears as Original.
His Sling Well is marked 1 digit below the 2nd example listed above of OI 40 A.

Here is SG 3,37 mil with OI 39 A in the Sling Well:










Has there been any Updates I'm not aware of with the Letter/Number markings found in Saginaw used stocks ?

Thx,
Charlie-Painter777

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