Frank,
What are you up to selling out?
Slings, They look fine to me. Weave looks good and we know both the Finial and Snap were made of blackened Brass. Or Steel when trying to conserve brass.
A while back I researched Fasteners..... a long story. But noticed that on the back of the Snaps there were 2 styles I found used on WWII gear. I see both on your Slings. With a Sling vertical looking at the backside of the snap you'll find some that have a punch hole at 12 o clock and 6 o clock. The 2nd type doesn't have these punch holes at 12 and 6.
In this sticky thread below on slings look at the 1st post by Thorin, his 3rd picture of his 43 dated sling and see the Punch holes. Then scroll down to JimF's pictures of his dated / marked slings and you'll see examples of both: Punch holes and No Punch holes. There was more than 1 supplier of these during WWII.
I have quite a few slings, med kits, pouches etc with examples of both.
https://www.milsurps.com/showthread.php?t=32228