It shall be no objection to the probative character of a deed, instrument, or writing, whether relating to land or not, that the writer or printer is not named or designed, or that the number of pages is not specified, or that the witnesses are not named or designed in the body of such deed, instrument, or writing, or in the testing clause thereof, provided that where the witnesses are not so named and designed their designations shall be appended to or follow their subscriptions ; and such designations may be so appended or added at any time before the deed, instrument, or writing shall have been recorded in any register for preservation, or shall have been founded on in any court, and need not be written by the witnesses themselves.