Shashi,what if I have printed a deposit slip of Rs. five lakhs also as I have cited an example of HSBC bank ?
In my case any entry I will put that can be questioned but only when it is proved that I have made that entry myself until then every entry is valid and useful for me otherwise why it is in the passbook .
Basic question is such entries without any signs or stamps of banks can be very problematic,public can not prove anything if some thing mischievous happens and even for banks it will become difficult to prove that someone has done these entries without actual transactions as they themselves are using this method of not putting any sign or stamp on the receipts.
Not only law but every science(even rocket science) is common sense but this common sense is not found in human beings commonly--sorry to say.