Another variation noted..

[Garandrew]

Per CCNL #346, Pg 5
My early Inland SN 208499 has the "." before .30M1


My Inland/SG SN, 712046 made around the same time frame has no "." before 30M1 on the receiver ring


My Inland M1A1 SN 592534, has no "." before 30M1 either

Information

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[Bill Hollinger]

I notice it has the stamp in the wood to the left of the receiver also. Very good!

[Garandrew]

Yes Bill, thats the stamp i pointed out in the carbine sold today for 36-3700..Its on early Inlands..its a good thing, yes

[firstflabn]

Inland die makers were good at what they did, but obviously they weren't professional typesetters. Even though the markings were applied before final heat treating, the service life of a stamping die was probably not very long. Not sure they could do the job with only one stamping fixture either. Let's see, 2+ million carbines, 800 production days, two 8-hour shifts; that's about 24 seconds to stamp each receiver. Their max production month would allow only 12 seconds per stamping. Would be interesting to look for variations between closely grouped serial numbers.

Today the specified marking would come as a computer file and all makers' markings would be identical. In that period when the stamping die wore out the die maker would create a new one with layout by the eyeball method.

[ulflyer]

Is that stamp on the wood unique to Inland stocks? I've seen it on one or more of mine but never knew what it signified.

[Garandrew]

I think its unique to Inland..are yours other than Inland?

[painter777]

Here's an old post with what looks to be the same stamp. Also some other links provided by USGICOLLECTOR with some other markings.

I found it by using the Google search box and typed in Ducks Foot.
Much quicker way to search the older posts.
Thanks for mentioning this feature Badger !

Charlie-painter777

M1A1 Stock Mark?? Early S/N !

Also Note, A picture posted by this forums member Dirt Detective,
My Carbine story - U.S. Militaria Forum

[Garandrew]

In a phone conversation several years ago, Ron Wellman suggested it was an early Inland mark..Hes seen it, and compared my pic, and said it was an Inland

[painter777]

Interesting all the same,
Thanks for sharing it.

Charlie-painter777

[jmark]

My Inland/SG #882766 looks like yours with no "." before the 30M1 either.