My original post was to locate the thread from some time ago which discussed the matters mentioned, I am aware that braising/vent holes etc. were still used up until the introduction of AA badges some of which are riveted as a technique of fixing overlays.
Like Jack I wish to find out when the application of overlays without the use of any visible means Vents/Braise Holes etc started. I am sure a 'new' technique with a date range was mentioned in the thread I seek
Paul
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