Thanks for responding mneary
. Here is some more info
On the back of the receiver ...
1) the big black chip is a LM358 (also has POCZ written on it).
2) On the PCB, on one side I see a big capital R, and below it is written, 11001100.
3) On the PCB, at the other end is written, MR100-BG.
On the transmitter,
1) ON back, the black chip has written on it RF and 6X.
2) On the front, above the crystal it says TO5A.
I tried getting a better shot again but in vain.
I bought these 433 Mhz RF modules from local shops here in delhi. The shopkeeper said they import it and only know that the range is 100m and the freq is 433Mhz.