Signed and dated Constant '69, bottom right in black pencil

Signed and dated Constant 2000, bottom left in pencil. Titled "Juanita", bottom left in pencil

Signed and dated Constant 2000, bottom right in pencil

Signed and dated Constant 2000, bottom left in black watercolor

Signed and dated Constant '71, bottom right in ink

Signed Constant, bottom right in pencil

Signed and dated Constant '89, bottom right in white pencil. Titled Die Winterreise, bottom left in white pencil.

Signed and dated Constant '94 bottom right, in pencil

Titled and signed, "ORPHEUS" Constant, bottom right in green and grey pencil

Signed and dated Constant '88, bottom left of center in brown ink