A very nice type A! It's unusual to see both a 'gauge' mark and the detailed bore-groove-twist numbers. Gauge marks mostly ended around WWI; 172,28 indicates the bore (not groove) diameter would pass a .300" plug but not a 156,14 gauge (.310") plug. The 7,62 7,82 250 show the bore groove and twist length in mm.

Good luck with your cataract surgery - you'll like the change!