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Just bought this and am curious about the barrel marking.

"Description:

serial #C3400, 30-30, 24" round JM-stamped barrel with a bright near excellent bore. The metal surfaces of this rifle retain about 94% original blue showing some high edge wear, small areas thinning to gray patina and some light scuffs along the left side of the barrel. The right side of the barrel is neatly stamped "SECOND" and the other markings are rather lightly struck but legible. The smooth pistolgrip walnut buttstock and forend remain in very good condition with the buttstock varnish rather heavily flaking throughout, scattered light handling marks and the forend is devoid of finish. The Marlin bull's eye is still present as are the original sporting sights minus the front sight hood. "
This will be interesting.

If you don't get an answer here you might try:

https://www.marlinowners.com/

There are people there who worked for Marlin for years.
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