Next is the end of the dowel that runs up the middle of the lower half of the stem. This is the only part that shows "patina (rust), but the end is still shiny from where it was crudely ground. Seems to me in production, the end might have been turned in a lathe and over 75 years, the patina would have covered the ground portion.
This one has British casting marks on the upper cast part. No other part numbers are anywhere on the mount. The cast part number is nice and clear on the one side, but a little faint on the other. There would appear to be a small locating mark in the tube at the top where it meets the cast stem.
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