About: http://webisa.webdatacommons.org/166395184

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I had heard an (unreliable) estimate of only 50, but I have personally seen three examples of this lens now bearing the engraved serial numbers: 45, 51 and 102.Below is an example of this interesting lens:
http://www.w3.org/ns/prov#wasQuotedFrom	antiquecameras.net