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Description
76R3920 - Replacement Heater Core For Red Dot Model R-3500 Units76R3920 Replacement Heater Core For Red Dot Model R 3500 Units 76R3920 CORE LENGTH: 17 1 2'' CORE HEIGHT: 8'' CORE WIDTH: 2 1 4'' OEM Numbers 76R3920 Specifications Product Condition: New 100% brand new and high quality. The product is the same size as the original part, and replacement is simple. One year warranty, shipped within 1 2 days and delivered within 10 20 days. To avoid buying the wrong accessories or should any problem arise, email us for
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Exchange/Return Notes
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.4 ★★★★★
Based on 479 reviews
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Product Reviews
★★★★★ 5
Good cheap watch
Color: Black Black
Nice cheap watch that gets the job done and looks good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 16, 2026
★★★★★ 3
Two tone color
Color: Silver GunColor, Color: Silver GunColor
I guess it’s good enough for what you pay but the band and base of the watch color do not match and it’s noticeable.
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Reviewed in the United States on December 8, 2025
★★★★★ 5
Good quality
Color: Gold Black
Nice watch
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Reviewed in the United States on December 28, 2025
★★★★★ 5
Great watch for preteen and above
My 12yo loves this. It’s stylish, durable and a great quality.
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Reviewed in the United States on November 9, 2025
★★★★★ 5
Love the blue numbers
Not quite sure how to rate this. It's an attractive basic analog watch; I especially like the blue numbers. And my experience with the reliability and durability of Casio has always been terrific. But... it's huge. I am stunned to see the other review that states that this watch is too small and is suitable only for a child; I think the reviewer must have been reviewing some other model. This one is larger than any other watch I own, including a hand-me-down men's watch that I got from a friend. This is NOT a unisex watch and should not be advertised as such. But if Casio would make the same thing in a women's model, I would snap it up.
UPDATE: When my smaller watch died, I finally started wearing this one. I've gotten used to the size, and now it looks and feels normal to me instead of huge. I adore the blue numbers--they make me happy every time I look at the watch.
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Reviewed in the United States on February 6, 2016
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