Cover: Cooper Type 4h

This is a cancellation used in Bombay circle starting 1855 till 1873 (basis Cooper). This cover is cancelled with Poona cancellation bearing office number 52 and fine 9 lines running from right to left with clear digits, used on March 19, 1872.

Another circular cancellation reads on top as 'xxECT1' which I believe refers to Section1 and centre shows DN (down) meaning cover heading away from the main station line. Line at bottom appears to show 'NW Line'.

Type 4 had multiple varieties and I strongly feel this cover with 9 lines and clean figure, making almost perfect square is of type 4h. Only reason for doubt is, lines are measuring at about 16mm, while Cooper mentions lines to be between 19 and 21mm

Would look forward for some expert to throw some more information around this cover.