JC--Thanks for the posting. The lockplate marking of "SPRINGFIELD" on your musket is quite rare. When Springfield decided to move the Springfield name to the rear of the lockplate, they apparently did not have the marking dies with the new "SPRING / FIELD / 1817" so for a very brief period they used the "SPRINGFIELD" in an arch until the new dies were ready.
Your musket is what collectors call an 1812 Type IV or 1812/1816 Transition Musket.
Thanks for showing the photo and for buying my book, looking forward to seeing your additional photos. If you ever have any questions about these muskets feel free to contact me.
Kent