Figure 7. The goggles are smooth sided, lacking the ‘cheese grater’ vents of the WWII SLM goggles. The slight curve to the glass and smooth frame with the tags for bending and securing the glass can just be discerned. Right, a pair of M&Co goggles (foreground), compared to a pair of WWII SLM’s. As well as the differing frame surface features they are larger and have a single layer of curved blue glass.