I thought I'd add another update.
I realised that a cost-effective way to get screen-accurate glasses is to make them myself.
I've looked at hundreds of vintage glasses and come to the conclusion that glasses like Henry's didn't exist in the period.
His glasses are a strange hybrid. The hardware is correct but the bridge is quite small and the lenses are huge.
In the upper-right photo in the collage below the bottom lenses, the tinted ones, are the ordinary adult size of the period. The thing in the 1920s and 1930s was to minimise the glasses by making them rimless and small.
But think about the style of glasses popular in the 1980s! Think of the enormous glasses worn by Barb in
Stranger Things. Those are no exaggeration! I can see the
Last Crusade costumer thinking "I'm not going to put one of our biggest stars in dorky little glasses". (Remember this was long before stars like Johnny Depp made tiny lenses cool.)
About the bridge, it's smaller than the bridges seen on period adult mens' glasses, rather it's the size seen on period women's or youth's glasses. In the upper-right photo in the collage below the upper bridge is adult size, the one fitted to the lenses is women's/youth's size.
So to get all these odd proportions right meant cobbling together the glasses myself. The temples are from period men's glasses, the bridge from a pair of period women's or youth's glasses, and the lenses are entirely modern.
Happily lenses are super cheap to get! I harvested them from the inexpensive "fashion" glasses sold for under $10 on Ebay etc. I was able to find lenses the right size and very close to the correct shape.
Beyond the glasses I've added the "shot Dad" cosplay with bloody shirt and un-tied tie, and a "Scottish Dr Jones" in Highland Dress.
