The belly on A engraved rifles wasn't normally engraved, that was reserved for higher grades. The style is right, but it doesn't look right. No scrollwork on the top of the receiver, no lines along the edges of the receiver, no etching on the top front of the receiver - all of this is very odd as well. I'm going to say it's very likely not factory..

1899A in 32-40 with A engraving:

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“The Savage 99 Pocket Reference”.
All models and variations of 1895’s, 1899’s and 99’s covered.
Also dates, checkering, engraving.. Find at www.savagelevers.com