As threatened, I took this pic of my favorite go-to 'heavy' hammer plus an unusual all-wood mallet.
The one I think of as a "European style Engineer head" was a cheap garage-sale buy cause the handle was bad, but an easy fix with a new USA hickory replacement and the full hammer now weighs 36 oz.
My guess is it may have been a 1200g head and I think the handle had some remnants of a German brandname (long gone so I can't confirm anything) the head still has traces of red paint.

The all-wood (beech or birch I believe) mallet has been misused a little on "things too hard" so dents are present on the contact surfaces but it's still usable (only for tapping wooden handle tools).
The design reminded me of "Japanese" but with the North European wood it was likely made somewhere there, but no ID marks at all