Recent auction had a 1920 BSA Light and saw that it had a 21a sight which fits well with my 1919 Light with the rarer 21b sight. Now having both is a real kick, given they didn’t make them that long. But what stood out to me in the auction pics was the etching. Pretty dramatic condition. This new to me rifle is in the best shape of the two. Only downside is the normal rear sight has been removed so as not to interfere with he aperature. Both these rifles came that way. Will be interesting to see how it shoots but a cold snap just rolled in. Hopefully soon.
Took pics of the 21a sight while I had it off cleaning it.
https://imgur.com/a/QbKBTLJ
Pics of the two rifles followed by many showing detail of the one with the 21a.
https://imgur.com/a/VNeHCqs