My 1903 Springfield did not have an A1, but it did have 'Mark I' under the model.
My RIA has 1903, with no A1 after the model.
It seems to be many different ways to mark a receiver.
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SOME of the markings are fraudulent, especially on high dollar rifles.
I have seen receivers remarked with a pantograph on occasion, but
the markings of a rolled vs. pantograph are very obvious, if you know
the difference between them.
Other rifles have the receiver mutilated in an effort to disguise the rifle.
So, to state, this is the way, or that is the way, isn't cast in steel , but
it is a good starting point, especially between the older and newer rifles.
It is best to ask questions and post pictures, if there is any questions
about the rifle. There are many VERY knowledgeable people out there!
And I thank them all for answering my ignorant questions, THANKS PEOPLE!