My grandfather was also a portraitist in watercolour and in oils, but the only ones I know of are the family portraits.
I am listing this under ‘Not Yet Seen’ as so far I have only seen this American forgery.
The Law Courts. ‘Printed in U.S.A.’, 11.3 x 8.8cm. with forged signature
It is signed in ink, something I have never seen on a Smythe before, and the signature bears only a vague resemblance to his. Grundy’s editions were printed in the UK, and I suspect the original image to be at least twice these dimensions.