221g during dropbox - Valid visa cancelled without prejudice

[nvedia]

My current H1B stamp on the passport is valid till Dec 30, 2018 (for I-797 valid till Dec 30, 2018 )

New I-797 is valid from Dec 30,2018 to Dec 30, 2021
My employer, client, designation, work location etc was same so was eligible for dropbox 
I went for H1B dropbox stamping in India on Oct 30, 2018 and got 221g 2 days ago with interview request
Old H1B stamp(valid till Dec 30, 2018) is also marked with "CANCELLED WITHOUT PREJUDICE" (not sure why they did this since I had no other visa on the passport)
I am planning to go for the interview in Delhi in few days

My question is I have plans of travelling back to US on Dec 2. Is it possible since old visa is cancelled though it was valid
If new visa is stamped, Wouldn't it start with Dec 30, 2018?

[Chai]

The stamped visa is gone. You cannot travel on that visa. If the new visa is granted; most likely it would be from the date of your interview, so you should be ok. 

[shekar11#]

On 11/11/2018 at 12:23 AM, nvedia said:

My current H1B stamp on the passport is valid till Dec 30, 2018 (for I-797 valid till Dec 30, 2018 )

New I-797 is valid from Dec 30,2018 to Dec 30, 2021
My employer, client, designation, work location etc was same so was eligible for dropbox 
I went for H1B dropbox stamping in India on Oct 30, 2018 and got 221g 2 days ago with interview request
Old H1B stamp(valid till Dec 30, 2018) is also marked with "CANCELLED WITHOUT PREJUDICE" (not sure why they did this since I had no other visa on the passport)
I am planning to go for the interview in Delhi in few days

My question is I have plans of travelling back to US on Dec 2. Is it possible since old visa is cancelled though it was valid
If new visa is stamped, Wouldn't it start with Dec 30, 2018?

Visa stamp will always have a issue date. Does not have anything like start date.