I'm trying to find out if anyone can identify this marking, which MIGHT be on a portion of an insulator. it was found among other glass items during an archaeological project. The mark appears on what MAY be an insulator dome shard that appears it could have been knapped (for a scraper or Indian tool?), and is possibly a shop number on a Brookfield insulator(??) If anyone can Definitely identify this marking (or if they have seen it on a bottle or another type of glass) or can ID it as a shop number they have persnonally seen on an insulator, can you please email me at email@example.com ? Thanks!!