2924 Ellis Street, Berkeley
Date is upside-down.
Arch Street, at The Berk (2311 Le Conte Avenue), Berkeley
There’s just one example of this mark in Oakland, from 1904.
2108 Russell Street, Berkeley
George H. Hall was an early Berkeley contractor and was probably the Hall of Hall and Nelsen. There are no Geo. Hall marks in Oakland, but I’ll keep this one anyway.

1042 63rd Street
Here’s another example of the mysterious mark I found on Alcatraz earlier this year. Now it’s revealed as a unique crescent design, but I couldn’t decipher the name until I found “Robt H” Hahn in the directory. He was listed that year as living at 3043 Grove Street (now MLK Way).
It appears that the R and the N are reversed. Perhaps a better example will turn up in Berkeley.