Seed Merchants, Hurst Seal, Image by StuE, Found by Paul Hewett.
Found in Essex, 22mm, 8.9g.
HURST & ... curving downward at the top LONDON across middle // blank other than possibly the top of a figure 5
A seal with more information on it is needed to narrow down the company name.
From Paul Cannon, "I think the following link provides a good candidate for this being a seed merchants seal -
"Hurst & Son were seed merchants in London, established in 1843 by William Hurst and W. G. McMullen. The latter retired after a short time and Hurst’s son, also called William, joined his father in partnership.
The company had offices at 6 Leadenhall Street, London EC3 and had warehouses at 52 Gun Square, Houndsditch, for garden, flower and agricultural seeds, and flowering bulbs."