Hi
Have a search for other billhook entries on the site for more info, but just to extend the geographical aspect...
In the UK there are several hundred regional billhook patterns - even in some counties there are local variations... in Wiltshire, where I live there used to be Warminster, Imber, Salisbury and Downton patterns, as well as the more common Chippenham pattern. The Buckland family from Netheravon made their own pattern, as did Down of Mere... we also 'poached' tools from the neighbouring counties, so it was common to find Berkshire, Hampshire, Dorset, Somerset and Gloucestershire patterns near the county borders...
Makers would also make any pattern to order, so if a local farmer or landowner wanted something different, he would send a paper pattern and a minimum order (usually a dozen) and yet another pattern entered the catalogues - ditto some local iron-mongers (hardware stores), who often also had their name and location stamped on the blade...
Standard blade shapes were also made in differeny sizes, some makers offering from 7" to 12" in 1/2" increments.... Apart from the 100 or so large industrial makers, many more hundreds of regional makers were still in existence until WWll....
In France the situation was similar - Talabot, a large manufacturer boasted over 200 patterns in their 1935 catalogue, but held templates for over 3000. Most European countries had a wide regional variation in blade shape, handle style, thickness, dish, single or double edged, concave, straight or convex etc...
I have collected over 4000 names of French Edge Tool makers from about 1870 to 1930, most of whom made billhooks - and over half of my french billhooks have a maker's stamp not in my list - so it is likely there were as many regional styles as there were villages...