This sign is so perfectly in tune with current vintage fashions that it's hard to guess its age. However, Lil's Cafe seems to have been gone for some years from this building next to the Corn Exchange. Before closing, it had been around long enough for the sign to be repainted at least once: under the black scrolls and white lettering of 'Lil's' and 'open daily' can be seen an earlier version with red flourishes surrounding a dark script.
None of this brings us close to the actual age of the sign - if anyone knows, I'd love to hear from you!