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Thank you, it looks like 1964 , ironically the same year i was born.Here is a link to many of the Western Catalogs from the era:
International Ammunition Association Resource Center
cartridgecollectors.org
You can look through them to see if you can find that specific cartridge "SX4134"
Best of luck in your search,
This. I say early 60's. Thanks.Prob from the 50s or 60s