All the above mentioned double documents belong to the Ptolemaic era; in Roman times this type of document is rare and is certainly not a continuation of the Ptolemaic double document (38).  There are the diptycha, two wax tablets, on the first of which the scriptura interior was written, protected by the second tablet. On the upper part of the latter, the scriptura exterior and the signatures of the seven witnesses, who sealed the diptychon, were recorded. An example is P. Mich. VII 444 (39):  the contract is written in Latin, the three surviving signatures are in Greek (NN ejsfravgisa, "I, NN, have sealed"). This system was adapted for papyrus (40):  the papyrus was folded, with the scriptura interior inside, and sealed. The outside of the papyrus holds the scriptura exterior, as well as the signatures of usually seven witnesses and their seals, the signatures being equally spaced along the joined top and bottom edges. These documents are called diplwvmata; they were usually Latin contracts, with Greek and/ or Latin signatures.
 

Probably a development of these techniques are the Greek double documents (41)  that are written twice and of which the scriptura interior was rolled up and sealed; then, on the verso of the scriptura exterior (42),  the witnesses recorded, next to their seals, their signatures: NN ejsfravgisa and/ or Latin NN signavi, "I, NN, have sealed" (43).  Of one such document the eight small seals have been preserved [see List No. 71]. They were detached by the restorer.