 "A Calm": indubitably authentic see here for this painting

 detail: 40 x 50; signed (?); "Becalmed on the Thames: 1740" (whence the date ?) compare next picture below
 18 x 22; unsigned; "Three East Indiamen in a Calm"; Christie 23 Nov 1979, lot 22
 are both --- or either --- of these by monamy?
 signed & dated 1734: this year was probably one of the most depressing of monamy's life
  27 x 36½; unsigned (?) detail: "A Calm"
Do all the above paintings issue from the same source?
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