Carbine sling

I was going through some slings this afternoon and came across this one.

D Clip, marked under snap, and what looks like an MRT stamp.

https://www.milsurps.com/images/impo...fb354241-1.jpg

https://www.milsurps.com/images/impo...d4bfc882-1.jpg

I.B.M. 1943, to me.

Could be....with replacement tips.

The last 'letter' above the date appears to be 'CO.' to me and the date could be any year in the 40's because the last digit is totally illegible. Isn't there an S M CO. marking (Schlagel?)? Why would they replace the tips? Maybe unfinished surplus web assembled after the war with updated hardware & MRT marking? I have never heard of MRT until Korean or post-Korean era. But, I don't have the CC newsletters. Educate me.

C-tips can come off fairly easily. Quite a few legit slings have been observed with a single D-tip relacement. It wasn't just the carbines that received repairs and upgrades. So did the bayonets and slings. In stock web gear could easily have been pulled out of stock and received the mildew resistant treatment. And I agree on the S.M. Co. identification.