At a guess, 19-teens. What I most like about this pattern (after the brilliantined hair, the jaunty pose, and the spats) is the fact that the gentleman is wearing a tie.
I'd like to know if there is a particular name for this style of overalls, which have no waist belt - the bib and trousers are cut in a single length.
Both the fly and the shoulder straps are buttoned.
This is an unprinted pattern.
When I unfolded the pocket piece, I found this fairly substantial thread of fabric. Note that it's plied blue and white. This is not typical of the yarns used to make denim, chambray, or hickory stripe. If used in both the warp and weft, fabric made of this yarn would have had a mid-blue color, somewhat similar to chambray (even though the construction is different.) Because dyeing adds cost, plying dyed and undyed plies will eventually yield an economical fabric. This contributes to an overall sense of the thrift of making work clothes at home.