Howdy all,

Anyone want to venture a guess as to the meaning of these watchmaker marks in red, on this speedy reduced inside caseback? I’m guessing something happened in April 2020, but I can’t make out the symbols. Looks like it could be a W/T, but seller is in Japan so they could also be Japanese characters.

These watches seem to be pretty low on the depreciation curve and this one is a good example, but I’m concerned about service costs which I understand are considerable on this movement. Seller claims to have no service history and has not owned the watch long.