I searched this topic and found some Zenel discussion but nothing with these numbers. Looking at Alloy-Artifacts I think they are tappet wrenches.
On one side there are marks that could be owners marks, or are they date codes? What year were these from?
Yes, tappet adjustment wrenches. That’s what the 34XX series is. I have four of that series, one each of 3420, 3422, 3424B, 3426. They were usually sold in pairs, though I think used in threes. Maybe the third was a different size?
Owners marks are almost always stamped, ground or engraved - all subtractive processes (sometimes welded or plasma cut). Those marks are raised, so forged-in during manufacture.
Looks like Aug1937 (HO) and Mar1938 (CP) to my eyes. Lugz is right about posting what you can see - I’m not confident about that’s an “O”. I don’t think 1951 & 1952, because they wouldn’t include “Made in“ after June 1946; also not sure tappets were offered in Zenel that late (Bonaloy instead).
I can’t say I’ve seen many in Zenel alloy, though I haven’t really tried. By contrast, of the earlier CV alloy version with both ends having the same opening with different angles, I have dozens.
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