What is the Leica code name for this?

[kkdanamatt]

Made in Wetzlar, this turret for the M2 and M3 accommodates 3 screw-mount lenses, converting them to M-mount and allowing the user to switch focal lengths quickly.

I can't find the usual Leica code name anywhere.

 

[andrewmore]

OROLF

250 only made in 1960

Andrew More

 

[kkdanamatt]

Thanks for the info.