H4 Visa - H1b - H4 stamp required ?

[sasibk]

I came to US with H4 visa stamping (valid till Oct 2016).

But in Oct 2015 I moved to H1B, now I am going to apply for H4 COS.

Once I receive my receipt, if I travel to India on Sep and be back before my h4 stamp validity ceases, can I come back without any stamping ?

Or should I have a new H4 stamp ?

[sasibk]

Any help is appreciated.