The Kissaten Tamago Sando (喫茶店たまごサンド) is traditional coffee shop egg sandwich; often toasted, sometimes with more generous filling than konbini.
It sits within the Japanese Sandos family of French sandwiches — specifically the The Tamago Sando cluster, which gathers the regional and stylistic variants that share its frame.
For the broader The Tamago Sando tradition that frames this sandwich, see The Tamago Sando.