Examples of the type
1852 A 
– (en) 1st type narrow head, barbichette less twisted, see comments
– (en) 1st type narrow head, barbichette less twisted, see comments
1852 A – (en) 1st type narrow head, barbichette less twisted, see comments
– (en) 1st type narrow head, barbichette less twisted, see comments
1852 A – (en) 2nd type large head, barbichette more twisted, see comments
– (en) 2nd type large head, barbichette more twisted, see comments