The signature on the DGD must be in a style which both the Origin State and the Destination State recognize as a legal signature. In Japan, even if a rubber stamp carries the impression of a Japanese character signature or an English letter signatures, you will still need a red official chop of the firm, the officer or the person in charge to make the rubber stamp legal. Banks will not accept a document with just the rubber impression stamp of the signature.
You need the official red chop to draw money from the bank. For DGD, we would not know whether the destination state approves a rubber impression stamp as being legal.
18.104.22.168.1 states: ?gFacsimile signatures?ireproduced signatures?jare acceptable where applicable laws and regulations recognize the legal validity of facsimile signatures.?h
Since many countries May not recognize the legal validity of a rubber stamp, it is better tohave the DGD signed by hand.