This stencil marking from Daniel Sewell's California studio
is the only reported use of a 25¢ stamp by a studio.
Whether it originated on a document of some kind
or an expensive photograph is open to speculation.
Interestingly, the name "Sewell" has been misinterpreted by
collectors as "Schell" for many years due to the warped nature
of this stencil, a point now clarified by the I.R.S records.
ex Morton Dean Joyce