Very nice first Omega at an excellent price, even if the dial is refinished!
This model is known as a "large medallion" case back...notice that the Seamaster logo, at 18mm, is larger than most medallions which were about 14mm. I don't believe a lot of collectors outside of this forum are very familiar with them...after all, the large medallion is unnoticeable when worn.
There is also case reference # 2975, including your 2846 2848 dual ref #. I also have owned a stainless reference 2867-2, caliber 503 date model which had a large case diameter of 38mm excluding the crown (38mm was considered jumbo size in the late 50's when common size cases were 34-35mm!)
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Supposedly these "large medallion" models were made for a short period of time, maybe 2-3 years, around 1958. They normally came with full rotor 20 jewel caliber 501, like yours.
I've owned them in stainless steel, yellow gold capped, and pink gold capped, the capped versions usually have matching color medallion (see my avatar). They also came in solid gold, which I have only seen, but not owned.
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