My attention was drawn to an artist who signed cards "Spatz." His cards had a crown on the back, and first appeared about 4 months before the first "crown" cards appeared in St Albans. So it was clearly worth investigating.
In fact it proved a false lead, and "Spatz" turned out to be a bank clerk living in Yorkshire who was called Fred Gothard. Fred later produced many First World War comic cards for the publishers E. Mack and/or J. Salmon cards signed ""F G". He also did some WW1 cards for Tuck & Sons.
While these cards turn out to have nothing to do with Hertfordshire I know many who follow this blog are interested in the war - and might like to see some of the war work of a rather unconventional and less well-known comic artist.