Evening Hymn, The

Beautiful example of a solid mahogany-backed interlocking puzzle from Zig-Zag with 10 Figural-shapes, or Whimsies.
As usual, a very fine quality print has been used of this charming artistic study of two children praying before bedtime.
The title of the hymn Gentle Jesus, Meek and Mild is printed on the lower edge. The price of 10/6 indicates this puzzle was probably produced c1920, as in 1915 such-sized examples were 7/6, according to leaflets produced at that time.
Please let me know if you are able to identify the artist of this beautiful painting. The signature looks something reminiscent of James Sinclair-Thank you.

Artist: Unidentified- James Sinclair?
Date: c1920
Brand: Zig-Zag Puzzle Company, The
Material: Solid wood
Nationality: British-England
Pieces: 350
Size: 16 1/2" x 11 1/2"
Theme: Children
Title: Evening Hymn, The