So it's a Model of 1905/second change from about 1909, then. I agree that the barrel markings look right. Note the reference to the U.S. SERVICE chambering in addition to .38 S&W SPECIAL. I think the secondary cartridge notice disappeared about this time; it's seen on some 1905/first change guns but as I recall not usually on the second change specimens. Still, if there were a lot of premarked barrels around, the factory wouldn't throw them away.
Looks good to me. If you're happy with the price, buy it.
EDITED TO ADD: I see Mike posted while I was looking up some info. I thought he might like this one! And I see some marks on the side of the front sight that under enlargement can possibly be read as LYMAN, so I concur with his judgment about that.
Last edited by DCWilson; 05-28-2016 at 09:26 PM.