Many English and Swiss manufacturers did not mark their products when they were to be sold on by another maker or a re-seller.
I am sometimes asked how the maker can be identified, frequently of course they can't be, particularly when the movement was from a small English maker or from many of the Swiss makers, when, particularly in the late 19th century, several makers made what was essentially the same movement.
The task is not helped by some makers imitating the cosmetic features of a more famous maker such as Omega or Waltham. Others movements were deliberately made to appear to be a classic English 3/4 plate or a Waltham 1883 model with the normal French markings of A / R for fast / slow removed so as not to give the game away.
On some occasions identification it is down to experience and comparing an unmarked example with a movement that is marked, although perhaps under a different name such as Vertex which was a trade name of Revue Thommen.
Just occasionally a movement marked for a re-seller slips through that does have a trade mark or name on it. This high grade Benson just finish restoration is, I think, only the second example of a Revue for Benson that I have seen which does have a trade mark.
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