Identify this EY please

[Fedele]

Hi. I need to find another of these eyepieces that i received with an used Intes Micro M500. on the plastic container is reported 12, but on the eyepiece I have no indications.
1) can you tell me the exact model and scheme?
2) where can I find another identical one?

[Fedele]

i think is a Erfle 12mm  72°  looking at old sales announcements