Is it permissible for a witness to testify based on recognizing their own handwriting if they do not recall the specific act of witnessing?

Primary text

There are conflicting reports regarding this matter. One narration states that testimony is not permissible unless the witness has an actual memory of the testimony. Ahmad, according to one report from Harb, held that one should only testify to what one knows. However, in another narration, Ahmad permitted testimony if the handwriting is recognized, questioning how testimony could otherwise be established. A third view suggests testimony is permissible if the document is written in the witness's own hand, kept under their seal and secure repository, even without explicit recollection. Ahmad also stated that a witness with poor memory should testify and record the matter.