It was a rainy day so I started looking through some of my slings and thought I would post a few different variations of the 1923 sling. I'm sure there are more but Bill Ricca is probably one of the few who can identify them. I have noticed two distinct patterns and what I'll call three variations. The square tip, the round tip, and the later MRT slings. The square tip slings are steel, the round tip are brass, and the MRT are round tip. Observations, the square tip slings have all steel hardware (1 has a brass slide keeper). The round end slings have all brass (non magnetic) hardware (1 has a steel slide keeper). The green or Nov 1951 MRT slings (round tab) have all brass hardware except one has a steel slide keeper. This remains consistent for the other 1923 slings I have that are not pictured. While they appear to be manufactured in 1942 I suspect they were either manufactured by separate companies (however, they look like SM Co) or just later in 42 when brass was a shortage material. Or they just could be repros but I don't think so as I have had several over the years in various used conditions. Any insight or comments are appreciated. Regards,CC