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Was suggesting this:
1. Beading in the stem looks too perfectly executed
2. The bell - form bowl does not look too old
3. The base should be raised all over with repoussé chased decoration, not made of four panels soldered together. The example of 1860 Continental candlestick base is attached to demonstrate how it was made; NOT raised; soldering lines are clearly seen in four corners (arrow). Look for a particular detail repeated in four panels (example given in smaller picture). If it repeats exactly the same way it cannot be hand repoussé chased decoration for obvious reasons. It’s stamped and cannot be 18th century. Even if not circular (easier to execute and far more common) 18th century silversmiths knew how to raise silver.
In a word, it does not look like 18th century silversmithing to me. You can take with a pinch of salt what I say, but I have seen chalices assembled from candlestick parts of much later date and punched with old marks.
Regards