Gates to the Sacristy at All Hallows by the Tower

All Hallows by the Tower is a small church near the Tower of London.  If you descend towards the crypt you can see a segment of Roman pavement from two centuries AD.  Then if you move further into the crypt you find the Altar to the Knights Templar, which is a historic site -as opposed to Dan Brown locations. The gates to the Sacristy say "By Hammer & Hand All Arts Do Stand".  The gates were made by the Blacksmiths guild. The Christian church was built over the Roman site (and over a Saxon church) in the 14th century and bombed during World War 2 and restored again post WW2.