You have a vertical 1/8 HP A.J. Weed steam engine.
It is a very nice and rare piece.
AJ Weed offered these in both vertical and horizontal configurations.
And sizes 1/8 HP, 1/4 HP, 1/2 HP, and 1 HP vertical and horizontal.
PM Research offers casting kits for copies of the vertical and horizontal only in the 1/4 HP size.
AJ Weed offered them in his 1892 catalog.
Grants Sipp (Sipp Machine) became successor to the engine business of AJ Weed and GE Wright before 1895.
The full line of Sipp and AJ Weed engines were offered in Sipp's 1895 catalog.
Great engine and I hope this is helpful.
Gil