The building was topped out in 1907 as the plaque in the apex says but what about the significance of 1833 and 1860, and the fact that all the numerals get larger as the short column descends. Perhaps it's a typographic device to show the passage of time, the trouble is I don't have the time to decode it. On the other hand maybe it's all about rebuilds and extensions, or perhaps period modernisations?
Never mind it's all part of life's rich tapestry, as people say. Or it's the Da Vinci Code in West Norfolk.
That's it, sorted. The answer to the conundrum is near.