Abstract: A device includes a viewfinder wheel with at least one viewfinder window, two or more code wheels rotatably coupled together with the viewfinder wheel about an axis, a plurality of characters, a plurality of code symbols, and a plurality of internal windows. The characters are spaced about a circumferential outer side of the viewfinder wheel and the code wheels. The code symbols are located in regions of a surface of each of the code wheels with each of the regions spaced out a different distance from the axis. The internal windows are in at least one of the code wheels adjacent the viewfinder wheel, wherein alignment of one of the characters of each of the viewfinder wheel and the code wheels at a key sequence location reveals through the viewfinder window and one or more of the internal windows a code sequence comprising a subset of the code symbols.

Abstract: A device includes a viewfinder wheel with at least one viewfinder window, two or more code wheels rotatably coupled together with the viewfinder wheel about an axis, a plurality of characters, a plurality of code symbols, and a plurality of internal windows. The characters are spaced about a circumferential outer side of the viewfinder wheel and the code wheels. The code symbols are located in regions of a surface of each of the code wheels with each of the regions spaced out a different distance from the axis. The internal windows are in at least one of the code wheels adjacent the viewfinder wheel, wherein alignment of one of the characters of each of the viewfinder wheel and the code wheels at a key sequence location reveals through the viewfinder window and one or more of the internal windows a code sequence comprising a subset of the code symbols.