Today in Postal History

This commercial cover was sent with the return address
of Gangapur City in Jaipur, an Indian feudatory state.
Gangapur City is about 240 km southwest of Jaipur
which in turn is about the same distance southwest of Delhi.
Gangapur City is just southwest (and unidentified) of Bhilwara on this map.

Many feudatory states had local postal systems carrying mail within their states.
Often their stamps were were overprinted to permit them to carry mail within all of India.

Jaipur first issued stamps in 1904.
Separate stamps were discontinued in 1949.

This cover is franked (upside down on the back) with a single
1931 ½a. black and violet Maharaja Sawai Man Singh II (SG 41).

The CDS used to cancel the stamp is quite interesting.
There are two strikes of the same cancel.
The one on the stamp is barely recognizable, however the the one off the stamp is fairly clear.
The date is shown as 7 JLY 37.
It appears that there is a name preceding Jaipur, but it is illegible.
Can someone identify it?
There is a very interesting sun symbol at the top of the CDS.
Is it associated with the Sun God, Surya?
Can someone explain it to us?

We need a translator to tell us what the destination of this cover was.
There appears to be a receiving mark on the back which also needs translation.

Opening reduced the cover slightly at the right.