Acknowledgment in writing restarts limitation period when signed, while undated writings allow oral proof of signing. An acknowledgment in writing of liability signed by the party (or by a person through whom he derives title or liability) before the prescribed limitation period expires restarts the limitation period from the date of that signature; if the writing is undated, oral evidence may establish when it was signed but not its contents. An acknowledgment need not precisely identify the right or property, may accompany refusals or set-off claims, and 'signed' includes signature by an authorised agent; execution applications are excluded from being treated as applications in respect of property or right.