I am after any information anyone has about the chrome window catches on early mk1 minis. I know they were used to approx may 63 etc. But over the last few years i have gathered up quite a few of them (over 50 infact) and have found so many varitaions in them. The most obvious varition is some have a plate on the bottom with 2 screws (so they easily can be pulled apart) and some dont. Some have the pin for two holes in glass and some dont. I know that the single hole glass was for the 59s. Some of the front catches have a hollow guts whether most are solid. I even have a catch with a pin (for 2 hole glass) that the guts of it is hollowed out. I also note some varitations with the numbers of the back of them. Some have 'P1' engraved in the back, most dont. Also i note that identical catches even with the same main number eg 7/23469/5, has another single number above this main number. Could this single digit be a date stamp? as in month of manufacturer? I have them ranging from 1-7 Surely if it was a month date stamp out of 50 odd catches i would have some with an 8-12?
I am restoring a march 63 Traveller currently that is going to absolute concours/showroom condition of how it come out of the factory and would like to put the right catches on it (seeing i have the choice).
If anyone can help with any information it would be greatly appreciated. (and no the catches are not for sale...not yet anyway

Thank you
Roy.