I am glad that SGPC tore down that clock tower built by british and built Ghanta Ghar (main entrance).. It's was the cheap attempt of missionary ppl to let christianity inside sacred sikh religious place...
Thanks for sharing pictures
here are some other pictures...
1860 painting with persian inscriptions
Notice how the nishaan sahib flags are of reddish colour, and not in the triangular shape that we see now days.
Picture taken in 1858