odd code on barrel of Remington M24
I'm hoping someone might know about the odd barrel code on a recently aquired Remington M24 / s/n 877XX. The code on the left side of the barrel near the receiver is O X ( which I understand to mean July of 1929 ) followed by either the top 2/3rds of the number 2, or the top 2/3rds of a ? symbol. It appears to be quite stylized, and maybe 25% larger than the O and X, but it appears to be struck off center so I can't tell for sure what character it is.
Also, this little plinker has a 19" barrel, and it's chambered and marked for .22 LR only. I thought the .22 short models had the 19" barrel, and that the .22 LR models had 21" ?
I'd appreciate any info!