How many variants of the Parker-Hale Model 5B Aperture sight were there made?

I have a "square" one, see picture 1 and one with a "slanted" side, see picture 2. At the bottom of the second picture you can clearly see the thread running for the height adjustment, something which is not visible in the square one.

I'm aware of the different eye pieces that are available.

Looking forward to hear from you.

Attachment 93977Attachment 93976
Information
Warning: This is a relatively older thread
This discussion is older than 360 days. Some information contained in it may no longer be current.