John Wilkes precision sight question

[bigduke6]

I picked this up with a M1917 I bought for parts, but it didnt have the backing plate/mounting plate, what I do know is that two plates were made for this, one for the Enfield No 4 and also the P14/ P17 just wonder if any one has one of the plates in there box of bits etc or any other plates were made ?

Other question is if you look at the pics the brass part of the aperture is a set up like the PH sights that contained the various size apertures etc, but this has several standard size apertures with different coloured inserts, just wonder if this was someones addition or this is how they were produced ?

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