I had some of those BITD, might've been called the JC or the 50? Regardless if that name is right, OP made a carabiner like that in the early 2000's IIRC.
Omega Pacific JC - they were my first carabiners back in 2001! I still use them (those that are left…). If I remember the marketing material correctly they split the round stock to give a wider rope wearing surface for the same weight as a full round stock carabiner. I like ‘em.